1MemoryProfiling(3) User Contributed Perl Documentation MemoryProfiling(3)
2
6 XXX This mostly a dumping ground for thoughts, and links at the moment.
7 Somewhere to gather the info so it'll be easier to find when someone
8 wants to work on it.
9 It's also focussed on runtime profiling of total memory usage over time
11 (rather than a detailed analysis of who 'owns' what memory as some
12 particular point in time, like the end of the program).
13 NYTProf currently only measures time and supports a limited range of
15 "clocks" (realtime vs cputime). For profiling memory we need to add a
16 new kind of "clock" that measures memory usage. Since we're
17 generalizing the concept of what gets measured (and how we get the info
18 from the system) a better name than "clock" would be "probe".
19 Conjectural terminology:
21 "Probe" means some measuring mechanism like get_clock(), times(), getrusage(),
23 that may yield multiple pieces of information with a single call.
24 "Measure" is one specific item generated by a probe.
26 Probe "time" uses times(), measures: "time.user", "time.user+sys" etc
28 Probe "clock" uses clock_gettime(), measures: "clock.realtime", "clock.monotonic" etc
29 Probe "rusage" uses getrusage(), measures: "rusage.majflt", "rusage.nvcsw" etc
30 Probe "memory" measures: "memory.bytes", "mem.allocs" etc
31 Probe "arena" measures: "arena.svs", "arena.bytes" etc
32 Generalize the concepts of probes. Have a structure defining a 'probe'
34 with pointers to functions to get the values, subtract values to get
35 relative ticks, return the tick units etc. Give them names and
36 attributes (cpu, realtime etc). User could then pick a probe by name.
37 By default we'd pick the best available realtime probe. Use the
38 subtraction logic where we currently handle times in the statement and
39 subroutine profilers.
40
42 "Memory profiling in Devel::NYTProf?: - June 2009
43 http://groups.google.com/group/develnytprof-dev/browse_frm/thread/1df4cba3001cd4e4/136812b44e9f7631
44 Talking about the problems of measuring memory usage of the whole
45 process re:
46 http://blog.robin.smidsrod.no/index.php/2009/05/26/memory-footprint-of-popular-cpan-modules
47 "Memory profiling possibilities in NYTProf" - September 2009
49 http://groups.google.com/group/develnytprof-dev/browse_frm/thread/c711c132216a3cea/035012e3dc2971ec
50 This includes a detailed overview of the issues.
51 "profiling memory" - Dec 2009
53 http://groups.google.com/group/develnytprof-dev/browse_frm/thread/5ffd24200866b0c1/201b58c18d826aaa
54 Nicholas Clark offers an experimental patch that intercepts malloc and
55 free and makes NYTProf measure memory usage.
56
58 Per-process memory information:
59 http://metacpan.org/pod/Devel::Mallinfo
61 Arena, stash, and pad based memory reporters:
63 http://metacpan.org/pod/Devel::Gladiator
65 http://metacpan.org/release/Internals-DumpArenas/
66 http://metacpan.org/release/Internals-GraphArenas/
67 http://metacpan.org/pod/Devel::DumpSizes
68 http://metacpan.org/pod/Devel::Arena
69 Per-object memory size reporters:
71 http://metacpan.org/pod/Devel::Size
73 http://metacpan.org/pod/Devel::Size::Report
74 Others:
76 http://metacpan.org/release/Devel-Memalyzer/
78 http://metacpan.org/pod/Devel::Memalyzer::Plugin::ProcSmaps
79
81 "Memory Efficient Perl" slides by jjore
82 http://docs.google.com/present/view?id=dg7kgpct_24cjs3c9fv
84 http://diotalevi.isa-geek.net/~josh/090402/frontend.png
85 Other profile/memory visualization tools
87 http://netjam.org/spoon/viz/
89 http://java.dzone.com/announcements/visualvm-12-great-java
90 http://blogs.perl.org/users/alex_balhatchet/2012/01/debugging-memory-use-in-perl---help.html
92 http://stackoverflow.com/questions/8715611/can-i-use-dtrace-on-os-x-10-5-to-determine-which-of-my-perl-subs-is-causing-the
94perl v5.32.1 2021-04-07 MemoryProfiling(3)