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Basic strace to see what a process is doing
Basic strace to see what a process is doing#
I had a long-running process and I wanted to check that it was at least doing something.
I know its PID (32425 in this case) - here’s how to use strace to see what it’s doing right now. This command outputs a lot of lines very quickly - hit Ctrl+C to stop it.
1$ sudo strace -p 324252strace: Process 32425 attached3lseek(4, 923287936, SEEK_SET) = 9232879364write(4, "\r\0\0\0\1\0\"\0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 40965lseek(3, 919687168, SEEK_SET) = 9196871686read(3, "\r\0\0\0\1\0\"\0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 40967lseek(4, 923292032, SEEK_SET) = 9232920328write(4, "\0\3kf\0\0\0\0\265\17I\247\326\307U\263xF\34\305\336\231\352a", 24) = 249lseek(4, 923292056, SEEK_SET) = 923292056So at least there’s stuff happening!
Running strace -c does a count of syscalls and provides a summary. The command appears not to do anything, but when you hit Ctrl+C after a few seconds it will dump out the counts so far:
1$ sudo strace -c -p 324252strace: Process 32425 attached3^Cstrace: Process 32425 detached4% time seconds usecs/call calls errors syscall5------ ----------- ----------- --------- --------- ----------------6 56.67 0.048823 28 1741 write7 29.60 0.025496 10 2613 lseek8 13.73 0.011828 14 871 read9------ ----------- ----------- --------- --------- ----------------10100.00 0.086147 5225 totalThe -k option adds stack traces to each syscall which give a better idea of where in the code the syscalls are being made from:
1$ sudo strace -k -p 324252strace: Process 32425 attached3lseek(4, 974466576, SEEK_SET) = 9744665764 > /lib/x86_64-linux-gnu/libc-2.27.so(llseek+0x7) [0x110327]5 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(unixWrite+0x5d) [0x393cd]6 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(pagerWalFrames+0x5e5) [0xa8e75]7 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(pagerStress+0x13f) [0xa9cff]8 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(getPageNormal+0x33a) [0xadeea]9 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(backupOnePage.isra.666+0x102) [0xa86c2]10 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(sqlite3_backup_step+0x2f2) [0xb7a12]11 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(sqlite3RunVacuum+0x95c) [0x10534c]12 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(sqlite3VdbeExec+0x1dbf) [0xe230f]13 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(sqlite3_step+0x210) [0xec3d0]14 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(pysqlite_step+0x1e) [0x23fae]15 > /home/ubuntu/datasette-venv/lib/python3.6/site-packages/pysqlite3/_sqlite3.cpython-36m-x86_64-linux-gnu.so(_pysqlite_query_execute+0x359) [0x22309]16 > /usr/bin/python3.6(PyCFunction_Call+0x52) [0x1670e2]17 > /usr/bin/python3.6(PyObject_Call+0x3e) [0x19fe1e] Basic strace to see what a process is doing
https://mranv.pages.dev/posts/basic-strace-to-see-what-a-process-is-doing/