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make -j does not work on RedHat7.7 VM

From: Zhu, Mason
Subject: make -j does not work on RedHat7.7 VM
Date: Tue, 21 Dec 2021 07:57:15 +0000



I have a problem with make -j parallel execution in our project build.


My environment information

OS: Red Hat 7.7 virtual machine with 4 CPUs



Architecture:          x86_64

CPU op-mode(s):        32-bit, 64-bit

Byte Order:            Little Endian

CPU(s):                4

On-line CPU(s) list:   0-3

Thread(s) per core:    1

Core(s) per socket:    1

Socket(s):             4

NUMA node(s):          1

Vendor ID:             GenuineIntel

CPU family:            6

Model:                 63

Model name:            Intel(R) Xeon(R) CPU E5-2698 v3 @ 2.30GHz

Stepping:              2

CPU MHz:               2297.339

BogoMIPS:              4594.67

Hypervisor vendor:     VMware

Virtualization type:   full

L1d cache:             32K

L1i cache:             32K

L2 cache:              256K

L3 cache:              40960K

NUMA node0 CPU(s):     0-3

Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm invpcid_single ssbd ibrs ibpb stibp fsgsbase tsc_adjust bmi1 avx2 smep bmi2 invpcid xsaveopt arat md_clear spec_ctrl intel_stibp flush_l1d arch_capabilities


GNU make:

/opt/rh/devtoolset-9/root/usr/bin/make  GNU Make 4.2.1

/usr/bin/make  GNU Make 3.82


gcc/g++: /opt/rh/devtoolset-9/root/usr/bin/gcc, /opt/rh/devtoolset-9/root/usr/bin/g++  gcc version 9.1.1 20190605 (Red Hat 9.1.1-2) (GCC)


If I build our project with /opt/rh/devtoolset-9/root/usr/bin/make  -j 4, there is only on g++ process. In other words, -j 4 parallel execution option does not work here. The project build takes 75 minutes.



If I build our project with /usr/bin/make   -j 4, I can see 4 g++ process. The project build takes only 25 minutes.



I checked related GNU make document. It seems no additional configuration is required for -j option.




I need your help to make progress in this task. Could you help to look into it?

Is this a misconfiguration in my project build environment or a bug in GNU Make 4.2.1?

Is there anyway to get it work?






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