What's the unit of `ru_maxrss` on Linux?
Solution 1
It's not a standard field for the rusage
structure so POSIX doesn't mandate anything about it. But on Linux
ru_maxrss
(since Linux 2.6.32)This is the maximum resident set size used (in kilobytes). For RUSAGE_CHILDREN, this is the resident set size of the largest child, not the maximum resident set size of the process tree.
Solution 2
The man page says:
ru_maxrss
(since Linux 2.6.32)This is the maximum resident set size used (in kilobytes). For RUSAGE_CHILDREN, this is the resident set size of the largest child, not the maximum resident set size of the process tree.
So, it's expressed in kilobytes, just like in BSD.
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Tianyang Li
Updated on June 20, 2022Comments
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Tianyang Li almost 2 years
This is from
man getrusage
struct rusage { struct timeval ru_utime; /* user time used */ struct timeval ru_stime; /* system time used */ long ru_maxrss; /* maximum resident set size */ long ru_ixrss; /* integral shared memory size */ long ru_idrss; /* integral unshared data size */ long ru_isrss; /* integral unshared stack size */ long ru_minflt; /* page reclaims */ long ru_majflt; /* page faults */ long ru_nswap; /* swaps */ long ru_inblock; /* block input operations */ long ru_oublock; /* block output operations */ long ru_msgsnd; /* messages sent */ long ru_msgrcv; /* messages received */ long ru_nsignals; /* signals received */ long ru_nvcsw; /* voluntary context switches */ long ru_nivcsw; /* involuntary context switches */ };
However it's not specified what's the unit.
I saw FreeBSD's documentation which says it's in kilobytes, but I'm not sure about what unit it is on Linux.
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Ami over 2 yearsActually, they are kibibytes (1024 bytes), and not kilobytes (1000 bytes)
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Ami over 2 yearsActually, they are kibibytes (1024 bytes), and not kilobytes (1000 bytes)