Webpack constantly needs 30% CPU.
top
top - 09:53:40 up 29 min, 2 users, load average: 1.39, 1.94, 1.66
Tasks: 130 total, 2 running, 85 sleeping, 0 stopped, 0 zombie
%Cpu(s): 7.8 us, 18.5 sy, 0.0 ni, 73.3 id, 0.0 wa, 0.0 hi, 0.4 si, 0.0 st
KiB Mem : 2040792 total, 289692 free, 1472500 used, 278600 buff/cache
KiB Swap: 2097148 total, 1839448 free, 257700 used. 381152 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2959 vagrant 20 0 1466436 645872 12568 R 27.4 31.6 8:00.78 webpack <<<###########
2993 vagrant 20 0 1720656 219612 20180 D 18.2 10.8 4:03.88 /home/vagrant/.pyenv/versions/venv3.9.0/bin/python manage.py runserver 8000
2939 vagrant 20 0 917256 64692 8968 S 7.9 3.2 1:55.74 webpack
ps aux --forest
2760 0.0 0.6 839884 13808 pts/0 Sl+ \_ node /usr/share/yarn/bin/yarn.js watch:hydra
2937 0.0 0.0 4644 0 pts/0 S+ | \_ /bin/sh -c cd javascript && yarn watch
2940 0.0 0.6 840144 13264 pts/0 Sl+ | \_ /usr/lib/nodejs/node-v12.16.1/bin/node /usr/share/yarn/bin/yarn.js watch
2958 0.0 0.0 4648 0 pts/0 S+ | \_ /bin/sh -c STATIC_URL=${STATIC_URL:=/static} webpack --config webpack.vagrant.js --watch
2959 33.7 31.6 1466436 645872 pts/0 Sl+ | \_ webpack
strace -p 2959
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 4) = 1
read(16, "1", 1024) = 8
futex(0x2a73780, FUTEX_WAIT_PRIVATE, 2, NULL) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x2a73780, FUTEX_WAKE_PRIVATE, 1) = 0
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 117) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 111) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 110) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 109) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 108) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 103) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 102) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 100) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 97) = 1
read(16, "1", 1024) = 8
epoll_wait(13, [{EPOLLIN, {u32=16, u64=16}}], 1024, 96) = 1
read(16, "1", 1024) = 8
futex(0x2a737e8, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x2a73780, FUTEX_WAKE_PRIVATE, 1) = 1
ls -l /proc/2959/fd
lrwx------ 1 vagrant vagrant 64 Jan 6 09:40 0 -> /dev/pts/0
l-wx------ 1 vagrant vagrant 64 Jan 6 09:40 1 -> 'pipe:[25920]'
lr-x------ 1 vagrant vagrant 64 Jan 6 09:40 10 -> 'pipe:[26989]'
l-wx------ 1 vagrant vagrant 64 Jan 6 09:40 11 -> 'pipe:[26989]'
lrwx------ 1 vagrant vagrant 64 Jan 6 09:40 12 -> 'anon_inode:[eventfd]'
lrwx------ 1 vagrant vagrant 64 Jan 6 09:40 13 -> 'anon_inode:[eventpoll]'
lr-x------ 1 vagrant vagrant 64 Jan 6 09:40 14 -> 'pipe:[26990]'
l-wx------ 1 vagrant vagrant 64 Jan 6 09:40 15 -> 'pipe:[26990]'
lrwx------ 1 vagrant vagrant 64 Jan 6 09:40 16 -> 'anon_inode:[eventfd]'
lr-x------ 1 vagrant vagrant 64 Jan 6 09:40 17 -> /dev/null
l-wx------ 1 vagrant vagrant 64 Jan 6 09:40 2 -> 'pipe:[25920]'
lrwx------ 1 vagrant vagrant 64 Jan 6 09:40 3 -> 'anon_inode:[eventpoll]'
lr-x------ 1 vagrant vagrant 64 Jan 6 09:40 4 -> 'pipe:[26987]'
l-wx------ 1 vagrant vagrant 64 Jan 6 09:40 5 -> 'pipe:[26987]'
lr-x------ 1 vagrant vagrant 64 Jan 6 09:40 6 -> 'pipe:[26988]'
l-wx------ 1 vagrant vagrant 64 Jan 6 09:40 7 -> 'pipe:[26988]'
lrwx------ 1 vagrant vagrant 64 Jan 6 09:40 8 -> 'anon_inode:[eventfd]'
lrwx------ 1 vagrant vagrant 64 Jan 6 09:40 9 -> 'anon_inode:[eventpoll]'
How could I find the root of the problem?
