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Use Jenkins executor-local PARALLEL value#3200

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WardBrian merged 3 commits intodevelopfrom
ci/use-parallel-from-executors
Jun 16, 2025
Merged

Use Jenkins executor-local PARALLEL value#3200
WardBrian merged 3 commits intodevelopfrom
ci/use-parallel-from-executors

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@WardBrian WardBrian commented Jun 11, 2025

Summary

Flatiron's Jenkins recently added some 8-core executors that we pick up on occasion, but we are currently hardcoding that we should only ever use 4 jobs for compilation. Each executor also sets $PARALLEL, so this should be 4 on most machines but occasionally it will be 8 and we will use all of them.

Tests

Side Effects

CI should be faster on average

Release notes

Checklist

SteveBronder
SteveBronder previously approved these changes Jun 11, 2025
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@WardBrian WardBrian mentioned this pull request Jun 11, 2025
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stan-buildbot commented Jun 11, 2025

Name Old Result New Result Ratio Performance change( 1 - new / old )
arma/arma.stan 0.32 0.3 1.06 6.0% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan 0.01 0.01 0.97 -2.8% slower
gp_regr/gen_gp_data.stan 0.02 0.02 1.08 7.24% faster
gp_regr/gp_regr.stan 0.1 0.09 1.09 8.44% faster
sir/sir.stan 72.16 67.7 1.07 6.18% faster
irt_2pl/irt_2pl.stan 4.28 3.87 1.1 9.46% faster
eight_schools/eight_schools.stan 0.06 0.05 1.05 5.14% faster
pkpd/sim_one_comp_mm_elim_abs.stan 0.26 0.24 1.09 8.03% faster
pkpd/one_comp_mm_elim_abs.stan 19.98 18.56 1.08 7.09% faster
garch/garch.stan 0.45 0.4 1.12 10.95% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan 2.85 2.58 1.1 9.31% faster
arK/arK.stan 1.88 1.71 1.1 9.08% faster
gp_pois_regr/gp_pois_regr.stan 2.95 2.73 1.08 7.38% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan 10.67 8.4 1.27 21.27% faster
performance.compilation 178.39 174.9 1.02 1.96% faster
Mean result: 1.0860179993866084

Jenkins Console Log
Blue Ocean
Commit hash: ae79d13bb5a669624fb639d9bb15aef05c4c6f00

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: VMX disabled
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
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

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WardBrian commented Jun 12, 2025

Looks like this shaved a little over an hour off a typical full PR run (one where all the distribution tests need to run)

@WardBrian WardBrian mentioned this pull request Jun 12, 2025
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stan-buildbot commented Jun 12, 2025

Name Old Result New Result Ratio Performance change( 1 - new / old )
arma/arma.stan 0.32 0.31 1.04 3.78% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan 0.01 0.01 1.07 6.68% faster
gp_regr/gen_gp_data.stan 0.03 0.02 1.07 6.47% faster
gp_regr/gp_regr.stan 0.1 0.09 1.05 4.93% faster
sir/sir.stan 73.36 67.6 1.09 7.85% faster
irt_2pl/irt_2pl.stan 4.26 3.93 1.08 7.62% faster
eight_schools/eight_schools.stan 0.06 0.05 1.07 6.85% faster
pkpd/sim_one_comp_mm_elim_abs.stan 0.26 0.24 1.07 6.92% faster
pkpd/one_comp_mm_elim_abs.stan 19.95 18.88 1.06 5.39% faster
garch/garch.stan 0.45 0.4 1.12 10.36% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan 2.74 2.61 1.05 4.93% faster
arK/arK.stan 1.87 1.76 1.06 5.68% faster
gp_pois_regr/gp_pois_regr.stan 2.91 2.73 1.07 6.19% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan 9.12 8.45 1.08 7.34% faster
performance.compilation 177.19 176.52 1.0 0.38% faster
Mean result: 1.06539357503582

Jenkins Console Log
Blue Ocean
Commit hash: ae79d13bb5a669624fb639d9bb15aef05c4c6f00

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: VMX disabled
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
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 WardBrian requested a review from SteveBronder June 13, 2025 17:30
@WardBrian WardBrian merged commit 7108183 into develop Jun 16, 2025
34 checks passed
@WardBrian WardBrian deleted the ci/use-parallel-from-executors branch June 16, 2025 13:22
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