runmqserver: fix/improve verifySingleProcess #420
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Instead of using `ps`, which reads three `/proc` files per each process (`stat`, `status`, and `cmdline`), use `pgrep` which only reads cmdline. Also, `pgrep` output is simpler -- it only lists PIDs, one per line, so to find out the number of processes we just need to count newlines. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
1. Check command.Run error, print it out (as debug only). 2. Simplify verifyOnlyOne() return values (bool is enough). 3. Add more logging. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
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A couple of patches to improve the
runmqservercheck for being the only process.1. cmd/runmqserver.verifySingleProcess: optimize
Instead of using
ps, which reads three/procfiles per each process(
stat,status, andcmdline), usepgrepwhich only reads cmdline.Also,
pgrepoutput is simpler -- it only lists PIDs, one per line,so to find out the number of processes we just need to count newlines.
2. cmd/runmqserver.verifySingleProcess: improve
Check
command.Runerror, print it out (as debug only).Simplify
verifyOnlyOne()return values (boolis enough).Add more logging.