Crashes on heroku for hash of 8 characters or larger.

[mishugana]

When running on a Heroku dyno, the farmhash prebuilt-install binary that gets downloaded crashes with an Illegal Instruction it actually only happens when calling any Hash function for strings of 8 characters or longer.

It seems to be using: [farmhash-v3.1.0-napi-v3-linux-x64.tar.gz] (https://github.com/lovell/farmhash/releases/download/v3.1.0/farmhash-v3.1.0-napi-v3-linux-x64.tar.gz)

Running uname --kernel-name --kernel-release --machine gives me: Linux 4.4.0-1078-aws x86_64

Node version : v12.18.4

proc/cpuinfo gives me:

processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 62 model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz stepping : 4 microcode : 0x42e cpu MHz : 2494.102 cache size : 25600 KB physical id : 0 siblings : 8 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes 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 rdtscp lm constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser fsgsbase smep erms xsaveopt bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit bogomips : 4988.20 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 62 model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz stepping : 4 microcode : 0x42e cpu MHz : 2494.102 cache size : 25600 KB physical id : 0 siblings : 8 core id : 1 cpu cores : 4 apicid : 2 initial apicid : 2 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes 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 rdtscp lm constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser fsgsbase smep erms xsaveopt bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit bogomips : 4988.20 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 62 model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz stepping : 4 microcode : 0x42e cpu MHz : 2494.102 cache size : 25600 KB physical id : 0 siblings : 8 core id : 2 cpu cores : 4 apicid : 4 initial apicid : 4 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes 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 rdtscp lm constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser fsgsbase smep erms xsaveopt bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit bogomips : 4988.20 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 62 model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz stepping : 4 microcode : 0x42e cpu MHz : 2494.102 cache size : 25600 KB physical id : 0 siblings : 8 core id : 3 cpu cores : 4 apicid : 6 initial apicid : 6 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes 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 rdtscp lm constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser fsgsbase smep erms xsaveopt bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit bogomips : 4988.20 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

processor : 4 vendor_id : GenuineIntel cpu family : 6 model : 62 model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz stepping : 4 microcode : 0x42e cpu MHz : 2494.102 cache size : 25600 KB physical id : 0 siblings : 8 core id : 0 cpu cores : 4 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes 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 rdtscp lm constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser fsgsbase smep erms xsaveopt bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit bogomips : 4988.20 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

processor : 5 vendor_id : GenuineIntel cpu family : 6 model : 62 model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz stepping : 4 microcode : 0x42e cpu MHz : 2494.102 cache size : 25600 KB physical id : 0 siblings : 8 core id : 1 cpu cores : 4 apicid : 3 initial apicid : 3 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes 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 rdtscp lm constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser fsgsbase smep erms xsaveopt bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit bogomips : 4988.20 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

processor : 6 vendor_id : GenuineIntel cpu family : 6 model : 62 model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz stepping : 4 microcode : 0x42e cpu MHz : 2494.102 cache size : 25600 KB physical id : 0 siblings : 8 core id : 2 cpu cores : 4 apicid : 5 initial apicid : 5 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes 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 rdtscp lm constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser fsgsbase smep erms xsaveopt bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit bogomips : 4988.20 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

processor : 7 vendor_id : GenuineIntel cpu family : 6 model : 62 model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz stepping : 4 microcode : 0x42e cpu MHz : 2494.102 cache size : 25600 KB physical id : 0 siblings : 8 core id : 3 cpu cores : 4 apicid : 7 initial apicid : 7 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes 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 rdtscp lm constant_tsc rep_good nopl xtopology pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm kaiser fsgsbase smep erms xsaveopt bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit bogomips : 4988.20 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

[lovell]

I'd expect the prebuilt binaries to "just work" on Intel Ivy Bridge CPUs such as the E5-2670 v2 as they support the sse4_2 flag.

Have you tried npm install --build-from-source? You should see greater performance improvements due to the ability to use AVX intrinsics.

[dlazares]

Hey any ideas/updates on how to fix this?

[lovell]

The compiler flags used to create the prebuilt binaries are:

https://github.com/lovell/farmhash/blob/32cc9728309ab88a6e16a31d6ee4081fa01a2a30/.github/workflows/ci.yml#L53

I think newer versions of gcc have renamed this CPU preset from corei7 to nehalem so perhaps we could try this? PR welcome.

[mishugana]

I'll look at this this weekend

[lovell]

The prebuilt binaries for v3.3.0 are now aligned with the x86-64-v2 microarchitecture.

https://github.com/lovell/farmhash/blob/7778a6a8fba4261d741b48ce1401f8ff5ee31fd8/.github/workflows/ci.yml#L93

Please feel free to re-open if there are still problems relating to this