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32 lines
725 B
32 lines
725 B
cat >hoge.cpp <<EOF
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <cstdint>
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int main() {
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int f = open("hoge.txt", O_CREAT|O_SYNC|O_RDWR, 0644);
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uint8_t data[4096] = {0};
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while(true) {
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write(f, data, 4096);
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lseek(f, 0, SEEK_SET);
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}
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close(f);
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return 0;
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}
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EOF
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g++ -g hoge.cpp -o hoge
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for pcount in $(seq 0 $(nproc --all)); do
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echo "[dummy process count: $pcount]"
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/usr/bin/time ./hoge&
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pid_time=$!
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pid_dummy=''
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for i in $(seq $pcount); do
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sh -c 'while :;do :;done'&
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pid_dummy="$pid_dummy $!"
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done
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vmstat 1 10
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pid_hoge=$(ps -o pid= --ppid $pid_time)
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kill $pid_hoge $pid_dummy
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wait
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done
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