• Hana (Hyang-Ah) Kim's avatar
    runtime/pprof: introduce "allocs" profile · cd037bce
    Hana (Hyang-Ah) Kim authored
    The Go's heap profile contains four kinds of samples
    (inuse_space, inuse_objects, alloc_space, and alloc_objects).
    The pprof tool by default chooses the inuse_space (the bytes
    of live, in-use objects). When analyzing the current memory
    usage the choice of inuse_space as the default may be useful,
    but in some cases, users are more interested in analyzing the
    total allocation statistics throughout the program execution.
    For example, when we analyze the memory profile from benchmark
    or program test run, we are more likely interested in the whole
    allocation history than the live heap snapshot at the end of
    the test or benchmark.
    
    The pprof tool provides flags to control which sample type
    to be used for analysis. However, it is one of the less-known
    features of pprof and we believe it's better to choose the
    right type of samples as the default when producing the profile.
    
    This CL introduces a new type of profile, "allocs", which is
    the same as the "heap" profile but marks the alloc_space
    as the default type unlike heap profiles that use inuse_space
    as the default type.
    
    'go test -memprofile=...' command is changed to use the new
    "allocs" profile type instead of the traditional "heap" profile.
    
    Fixes #24443
    
    Change-Id: I012dd4b6dcacd45644d7345509936b8380b6fbd9
    Reviewed-on: https://go-review.googlesource.com/102696
    Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
    Reviewed-by: 's avatarRuss Cox <rsc@golang.org>
    cd037bce
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