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Implement sampling for heap profiling.

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Jason Evans
2010-03-01 20:15:26 -08:00
parent f3ff75289b
commit b9477e782b
9 changed files with 202 additions and 60 deletions
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14
jemalloc/doc/jemalloc.3.in
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@@ -38,7 +38,7 @@
.\" @(#)malloc.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD: head/lib/libc/stdlib/malloc.3 182225 2008-08-27 02:00:53Z jasone $
.\"
.Dd February 11, 2010
.Dd March 1, 2010
.Dt JEMALLOC 3
.Os
.Sh NAME
@@ -355,6 +355,9 @@ will disable dirty page purging.
@roff_prof@.Dq B
@roff_prof@option for backtrace depth control.
@roff_prof@See the
@roff_prof@.Dq S
@roff_prof@option for probabilistic sampling control.
@roff_prof@See the
@roff_prof@.Dq I
@roff_prof@option for information on interval-triggered profile dumping, and the
@roff_prof@.Dq U
@@ -464,6 +467,15 @@ Double/halve the size of the maximum size class that is a multiple of the
quantum (8 or 16 bytes, depending on architecture).
Above this size, cacheline spacing is used for size classes.
The default value is 128 bytes.
@roff_prof@.It S
@roff_prof@Double/halve the average interval between allocation samples, as
@roff_prof@measured in bytes of allocation activity.
@roff_prof@Increasing the sampling interval decreases profile fidelity, but
@roff_prof@also decreases the computational overhead.
@roff_prof@The default sample interval is one (i.e. all allocations are
@roff_prof@sampled).
@roff_prof@A sample interval greater than one implicitly disables leak
@roff_prof@reporting.
@roff_prof@.It U
@roff_prof@Trigger a memory profile dump every time the total virtual memory
@roff_prof@exceeds the previous maximum.