require 'mwrap'
Mwrap has a dual function as both a Ruby C extension and LD_PRELOAD wrapper. As a Ruby C extension, it exposes a limited Ruby API. To be effective at gathering status, mwrap must be loaded as a LD_PRELOAD (using the mwrap(1) executable makes it easy)
ENVIRONMENT
The "MWRAP" environment variable contains a comma-delimited list of key:value options for automatically dumping at program exit.
dump_fd: a writable FD to dump to
dump_path: a path to dump to, the file is opened in O_APPEND mode
dump_min: the minimum allocation size (total) to dump
If both 'dump_fd' and 'dump_path' are specified, dump_path takes precedence.
Mwrap[location] -> Mwrap::SourceLocation source
Returns the associated Mwrap::SourceLocation given the location String. location is either a Ruby source location path:line (e.g. "/path/to/foo.rb:5") or a hexadecimal memory address with square-braces part yielded by Mwrap.dump (e.g. "[0xdeadbeef]")
Mwrap.reset -> nil source
Resets the the total tables by zero-ing all counters. This resets all statistics. This is not an atomic operation as other threads (outside of GVL) may increment counters.
Mwrap.dump([[io] [, min]] -> nil source
Dumps the current totals to io which must be an IO object (StringIO and similar are not supported). Total sizes smaller than or equal to min are skipped.
The output is space-delimited by 3 columns:
total_size call_count location
Mwrap.each([min]) do |location,total,allocations,frees,age_total,max_lifespan| ... end source
Yields each entry of the of the table to a caller-supplied block. min may be specified to filter out lines with total bytes equal-to-or-smaller-than the supplied minimum.
Mwrap.quiet do |depth| # expensive sort/calculate/emitting results of Mwrap.each # affecting statistics of the rest of the app end source
Stops allocation tracking inside the block. This is useful for monitoring code which calls other Mwrap (or ObjectSpace/GC) functions which unavoidably allocate memory.
This feature was added in mwrap 2.0.0+
Mwrap.reset -> nil source
Resets the the total tables by zero-ing all counters. This resets all statistics. This is not an atomic operation as other threads (outside of GVL) may increment counters.
total_bytes_allocated () source
total bytes allocated as tracked by mwrap
total_bytes_freed () source
total bytes freed as tracked by mwrap
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