Replace Boost numeric/odeint with existing SUNDIALS library by andrjohns · Pull Request #3357 · stan-dev/math

andrjohns · 2026-08-12T05:02:30Z

Summary

A companion to #3356, this PR replaces our dependency on the Boost numeric/odeint headers for the ode_rk45 and ode_ckrk functions with the ARKODE library from the SUNDIALS suite. The numeric/odeint headers brought in a massive footprint of files - namely the mpl and fusion libraries.

There are lots of file-changes due to the vendoring, but I've put that as a separate commit so it's easier to see just the Stan changes

Tests

N/A - existing tests should still pass

Side Effects

Slight reduction in compile times due to fewer includes

Release notes

Replaced the Boost odeint with ARKODE for the ode_rk45 and ode_ckrk functions

Checklist

Copyright holder: Andrew Johnson

The copyright holder is typically you or your assignee, such as a university or company. By submitting this pull request, the copyright holder is agreeing to the license the submitted work under the following licenses:
- Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
- Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
the basic tests are passing
- unit tests pass (to run, use: ./runTests.py test/unit)
- header checks pass, (make test-headers)
- dependencies checks pass, (make test-math-dependencies)
- docs build, (make doxygen)
- code passes the built in C++ standards checks (make cpplint)
the code is written in idiomatic C++ and changes are documented in the doxygen
the new changes are tested

stan-buildbot · 2026-08-12T11:14:23Z

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_regr/gp_regr.stan	0.12	0.11	1.03	2.94% faster
gp_regr/gen_gp_data.stan	0.02	0.02	1.02	1.9% faster
arK/arK.stan	1.65	1.65	1.0	0.17% faster
eight_schools/eight_schools.stan	0.06	0.06	0.99	-0.6% slower
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	8.91	8.83	1.01	0.95% faster
pkpd/one_comp_mm_elim_abs.stan	20.44	20.46	1.0	-0.08% slower
pkpd/sim_one_comp_mm_elim_abs.stan	0.26	0.27	0.96	-3.7% slower
sir/sir.stan	78.84	112.44	0.7	-42.62% slower
gp_pois_regr/gp_pois_regr.stan	2.76	2.47	1.12	10.54% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan	3.23	2.91	1.11	9.91% faster
irt_2pl/irt_2pl.stan	7.8	5.38	1.45	31.01% faster
arma/arma.stan	0.38	0.32	1.18	15.32% faster
garch/garch.stan	0.57	0.49	1.17	14.23% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.01	0.01	1.06	5.61% faster
performance.compilation	282.89	266.27	1.06	5.87% faster
Mean result: 1.0577041152587925

Jenkins Console Log
Blue Ocean
Commit hash: fb55e5ae8f992ecca9977e062d78369635037345

Machine information

No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal

CPU:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 48 bits virtual
CPU(s): 80
On-line CPU(s) list: 0-79
Thread(s) per core: 2
Core(s) per socket: 20
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
Stepping: 4
CPU MHz: 2400.000
CPU max MHz: 3700.0000
CPU min MHz: 1000.0000
BogoMIPS: 4800.00
Virtualization: VT-x
L1d cache: 1.3 MiB
L1i cache: 1.3 MiB
L2 cache: 40 MiB
L3 cache: 55 MiB
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79
Vulnerability Gather data sampling: Mitigation; Microcode
Vulnerability Itlb multihit: KVM: Mitigation: Split huge pages
Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown: Mitigation; PTI
Vulnerability Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed: Mitigation; IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Vmscape: Mitigation; IBPB before exit to userspace
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d arch_capabilities

G++:
g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang:
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

WardBrian · 2026-08-12T14:04:11Z

This needs to update https://github.com/stan-dev/math/blob/develop/lib/upgrade-sundials.sh#L117 to not delete the arkode files during sundials upgrades

andrjohns · 2026-08-12T14:57:43Z

This needs to update https://github.com/stan-dev/math/blob/develop/lib/upgrade-sundials.sh#L117 to not delete the arkode files during sundials upgrades

Argh good catch! Updated the vendor script and re-written the history to run it and commit the results

SteveBronder · 2026-08-12T17:48:05Z

Is everything up to 42a30df just upgrading sundials?

stan-buildbot · 2026-08-12T21:45:28Z

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_regr/gp_regr.stan	0.12	0.12	0.97	-3.61% slower
gp_regr/gen_gp_data.stan	0.02	0.03	0.95	-4.77% slower
arK/arK.stan	1.66	1.77	0.94	-6.42% slower
eight_schools/eight_schools.stan	0.06	0.06	1.02	1.81% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	8.96	9.01	0.99	-0.62% slower
pkpd/one_comp_mm_elim_abs.stan	20.91	20.48	1.02	2.06% faster
pkpd/sim_one_comp_mm_elim_abs.stan	0.27	0.26	1.03	3.05% faster
sir/sir.stan	78.58	112.79	0.7	-43.52% slower
gp_pois_regr/gp_pois_regr.stan	2.75	2.44	1.13	11.4% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan	3.09	2.94	1.05	5.1% faster
irt_2pl/irt_2pl.stan	6.62	5.71	1.16	13.76% faster
arma/arma.stan	0.38	0.46	0.83	-20.33% slower
garch/garch.stan	0.58	0.55	1.05	5.16% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.01	0.01	0.95	-4.82% slower
performance.compilation	282.08	294.25	0.96	-4.32% slower
Mean result: 0.9840462450866573

Jenkins Console Log
Blue Ocean
Commit hash: fb55e5ae8f992ecca9977e062d78369635037345

Machine information

No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal

CPU:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 48 bits virtual
CPU(s): 80
On-line CPU(s) list: 0-79
Thread(s) per core: 2
Core(s) per socket: 20
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
Stepping: 4
CPU MHz: 2400.000
CPU max MHz: 3700.0000
CPU min MHz: 1000.0000
BogoMIPS: 4800.00
Virtualization: VT-x
L1d cache: 1.3 MiB
L1i cache: 1.3 MiB
L2 cache: 40 MiB
L3 cache: 55 MiB
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79
Vulnerability Gather data sampling: Mitigation; Microcode
Vulnerability Itlb multihit: KVM: Mitigation: Split huge pages
Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown: Mitigation; PTI
Vulnerability Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed: Mitigation; IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Vmscape: Mitigation; IBPB before exit to userspace
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d arch_capabilities

G++:
g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang:
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

andrjohns · 2026-08-12T23:21:51Z

Is everything up to 42a30df just upgrading sundials?

Yep! Stan changes are only from 4cb6dff

stan-buildbot · 2026-08-15T14:26:23Z

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_regr/gp_regr.stan	0.11	0.11	1.01	1.17% faster
gp_regr/gen_gp_data.stan	0.02	0.02	1.0	-0.42% slower
arK/arK.stan	1.71	1.66	1.03	3.25% faster
eight_schools/eight_schools.stan	0.06	0.06	0.97	-3.06% slower
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	8.94	8.96	1.0	-0.19% slower
pkpd/one_comp_mm_elim_abs.stan	20.49	20.45	1.0	0.21% faster
pkpd/sim_one_comp_mm_elim_abs.stan	0.26	0.26	0.99	-0.5% slower
sir/sir.stan	71.73	111.57	0.64	-55.54% slower
gp_pois_regr/gp_pois_regr.stan	2.82	2.53	1.11	10.29% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan	2.88	2.88	1.0	-0.1% slower
irt_2pl/irt_2pl.stan	5.62	5.4	1.04	3.94% faster
arma/arma.stan	0.32	0.32	1.01	0.95% faster
garch/garch.stan	0.49	0.47	1.04	4.05% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.01	0.01	1.04	3.97% faster
performance.compilation	295.53	277.94	1.06	5.95% faster
Mean result: 0.9973879260578039

Jenkins Console Log
Blue Ocean
Commit hash: 53b05f515233eacd215228b863f6706ec835030e

Machine information

No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal

CPU:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 48 bits virtual
CPU(s): 80
On-line CPU(s) list: 0-79
Thread(s) per core: 2
Core(s) per socket: 20
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
Stepping: 4
CPU MHz: 2400.000
CPU max MHz: 3700.0000
CPU min MHz: 1000.0000
BogoMIPS: 4800.00
Virtualization: VT-x
L1d cache: 1.3 MiB
L1i cache: 1.3 MiB
L2 cache: 40 MiB
L3 cache: 55 MiB
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79
Vulnerability Gather data sampling: Mitigation; Microcode
Vulnerability Itlb multihit: KVM: Mitigation: Split huge pages
Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown: Mitigation; PTI
Vulnerability Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed: Mitigation; IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Vmscape: Mitigation; IBPB before exit to userspace
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d arch_capabilities

G++:
g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang:
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

wds15 · 2026-08-17T12:38:56Z

You upgraded Sundials - but did not go to the current 7.8.0 release? What was the rationale?

Don't get me wrong - this is not a must to go to the latest; just curious to know what the motivation is. Overall I think it is a good idea to move away from odeint in boost - as I recall the developer of odeint went to industry and is not super active in developing it. This is the status from a few years back.

andrjohns · 2026-08-17T13:13:22Z

You upgraded Sundials - but did not go to the current 7.8.0 release? What was the rationale?

Don't get me wrong - this is not a must to go to the latest; just curious to know what the motivation is. Overall I think it is a good idea to move away from odeint in boost - as I recall the developer of odeint went to industry and is not super active in developing it. This is the status from a few years back.

Oh I just added the extraction of ARKODES from the current version, I hadn't updated the version. Do you think it's worth bumping the version as well?

wds15 · 2026-08-17T13:33:05Z

Moving along the version gives one the benefit of a maintained software. I looked into it a while ago (pre Claude) and found it was a hassle as a few things changed. I'd think that it is a good thing to move along, yes. Sundials does not need the overall frequently, but now is certainly a good time... though to keep the PR reviewable I would not suggest to fold it into here.

SteveBronder · 2026-08-25T17:03:32Z

@dylex is the error we are seeing here because of the jenkins migration?

https://jenkins-new.flatironinstitute.org/job/CCM/job/Stan/job/math/job/PR-3357/2/

WardBrian · 2026-08-25T17:21:02Z

Until #3360 is merged you don’t want to look at Jenkins-new

https://jenkins.flatironinstitute.org/job/Stan/job/Math/view/change-requests/job/PR-3357/10/ Passed

stan-buildbot · 2026-09-20T19:10:03Z

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
stat_comp_benchmarks/benchmarks/gp_regr/gen_gp_data.stan	0.04	0.04	0.99	-0.99% slower
stat_comp_benchmarks/benchmarks/gp_regr/gp_regr.stan	0.17	0.16	1.01	1.01% faster
stat_comp_benchmarks/benchmarks/garch/garch.stan	0.87	0.86	1.02	1.96% faster
stat_comp_benchmarks/benchmarks/low_dim_corr_gauss/low_dim_corr_gauss.stan	0.01	0.02	0.94	-6.84% slower
stat_comp_benchmarks/benchmarks/eight_schools/eight_schools.stan	0.11	0.11	1.0	0.03% faster
stat_comp_benchmarks/benchmarks/low_dim_gauss_mix/low_dim_gauss_mix.stan	7.95	8.0	0.99	-0.63% slower
stat_comp_benchmarks/benchmarks/gp_pois_regr/gp_pois_regr.stan	3.72	3.7	1.0	0.49% faster
stat_comp_benchmarks/benchmarks/pkpd/one_comp_mm_elim_abs.stan	31.65	33.01	0.96	-4.29% slower
stat_comp_benchmarks/benchmarks/pkpd/sim_one_comp_mm_elim_abs.stan	0.38	0.37	1.01	0.67% faster
stat_comp_benchmarks/benchmarks/irt_2pl/irt_2pl.stan	6.91	6.91	1.0	0.03% faster
stat_comp_benchmarks/benchmarks/sir/sir.stan	129.65	165.66	0.78	-27.78% slower
stat_comp_benchmarks/benchmarks/arK/arK.stan	3.2	3.22	0.99	-0.59% slower
stat_comp_benchmarks/benchmarks/arma/arma.stan	0.6	0.61	1.0	-0.3% slower
stat_comp_benchmarks/benchmarks/low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	24.94	25.96	0.96	-4.06% slower
performance.compilation	391.73	368.11	1.06	6.03% faster
Mean result: 0.9813392958682653

Jenkins Console Log
Jenkins Build Stages
Commit hash: c865b6f141c9d526e21e2f2e20a3edf2aa0e1fe0

Machine information

Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.3 LTS
Release:	20.04
Codename:	focal

CPU:

Architecture:                            x86_64
CPU op-mode(s):                          32-bit, 64-bit
Byte Order:                              Little Endian
Address sizes:                           52 bits physical, 57 bits virtual
CPU(s):                                  192
On-line CPU(s) list:                     0-191
Thread(s) per core:                      2
Core(s) per socket:                      48
Socket(s):                               2
NUMA node(s):                            2
Vendor ID:                               AuthenticAMD
CPU family:                              25
Model:                                   17
Model name:                              AMD EPYC 9474F 48-Core Processor
Stepping:                                1
Frequency boost:                         enabled
CPU MHz:                                 1495.991
CPU max MHz:                             4114.4229
CPU min MHz:                             1500.0000
BogoMIPS:                                7189.39
Virtualization:                          AMD-V
L1d cache:                               3 MiB
L1i cache:                               3 MiB
L2 cache:                                96 MiB
L3 cache:                                512 MiB
NUMA node0 CPU(s):                       0-47,96-143
NUMA node1 CPU(s):                       48-95,144-191
Vulnerability Gather data sampling:      Not affected
Vulnerability Indirect target selection: Not affected
Vulnerability Itlb multihit:             Not affected
Vulnerability L1tf:                      Not affected
Vulnerability Mds:                       Not affected
Vulnerability Meltdown:                  Not affected
Vulnerability Mmio stale data:           Not affected
Vulnerability Old microcode:             Not affected
Vulnerability Reg file data sampling:    Not affected
Vulnerability Retbleed:                  Not affected
Vulnerability Spec rstack overflow:      Mitigation; Safe RET
Vulnerability Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:                Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2:                Mitigation; Enhanced / Automatic IBRS; IBPB conditional; STIBP always-on; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds:                     Not affected
Vulnerability Tsa:                       Mitigation; Clear CPU buffers
Vulnerability Tsx async abort:           Not affected
Vulnerability Vmscape:                   Mitigation; IBPB before exit to userspace
Flags:                                   fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good amd_lbr_v2 nopl xtopology nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba perfmon_v2 ibrs ibpb stibp ibrs_enhanced vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local user_shstk avx512_bf16 clzero irperf xsaveerptr rdpru wbnoinvd amd_ppin cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif x2avic v_spec_ctrl vnmi avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq la57 rdpid overflow_recov succor smca fsrm flush_l1d debug_swap

G++:

g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang:

clang version 10.0.0-4ubuntu1 
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

andrjohns force-pushed the boost-odeint branch from 3734ea1 to f06cd6f Compare August 12, 2026 14:33

andrjohns added 3 commits August 12, 2026 22:45

Update vendor script to include ARKODES

4638609

Re-run vendor script to vendor ARKODES

6c0d40c

Replace boost odeint with ARKODES

4cb6dff

andrjohns force-pushed the boost-odeint branch from 55f4070 to 4cb6dff Compare August 12, 2026 14:45

yashikno and others added 5 commits August 12, 2026 10:46

Merge commit '46a31337d1534a1a5d5368311d7f32aef5ecc957' into HEAD

d26fd6a

[Jenkins] auto-formatting by clang-format version 10.0.0-4ubuntu1

39f0559

Restore STAN_CHANGES

42a30df

Cleanup

268fed8

[Jenkins] auto-formatting by clang-format version 10.0.0-4ubuntu1

84394f2

Remove dead using mpl decl

6e49cc3

andrjohns mentioned this pull request Aug 15, 2026

Reduce Boost dependency footprint stan-dev/stan#3405

Closed

3 tasks

SteveBronder self-assigned this Aug 26, 2026

Merge branch 'develop' into boost-odeint

8c4cf7f

andrjohns mentioned this pull request Aug 31, 2026

Remove Boost iterator_range dependency stan-dev/stan#3419

Merged

3 tasks

andrjohns added 3 commits August 31, 2026 21:50

Merge branch 'develop' into boost-odeint

e9970d6

Align engine configuration to boost

c14401d

Correct test type

781d32c

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Replace Boost numeric/odeint with existing SUNDIALS library - #3357

Replace Boost numeric/odeint with existing SUNDIALS library#3357
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