From: Eric Wong <email@example.com> To: firstname.lastname@example.org, email@example.com Subject: [ANN] mwrap 2.1.0 mwrap - LD_PRELOAD malloc wrapper for Ruby Date: Sat, 11 Aug 2018 04:31:06 +0000 [thread overview] Message-ID: <20180811043106.GA9571@dcvr> (raw) Changes: mwrap 2.1.0 - heap_page_body struct tracking This release enables tracking of memalign allocations for "struct heap_page_body" in the Ruby GC. This can be useful for tracking deathspans (time between free and re-allocation) of heap page bodies which can cause fragmentation in some malloc implementations, including glibc. The documentation for it is available at: https://80x24.org/mwrap/Mwrap/HeapPageBody.html And a live demo runs at: https://80x24.org/MWRAP/heap_pages This release also includes global counters for Mwrap.total_bytes_allocated and Mwrap.total_bytes_freed 10 changes since v2.0.0 (2018-07-20): add olddoc.yml to generate links in page footers add .olddoc.yml to MANIFEST gemspec: use "git describe" output for prereleases add global counters for total bytes allocated/freed keep stats for memalign-ed heap_page_body in Ruby remove "memalign:" MWRAP option allow dump_heap: mask via MWRAP env tweak hpb stats destructor output struct acc: use 64-bit counters doc: 2.1 pre-release updates About: mwrap is designed to answer the question: Which lines of Ruby are hitting malloc the most? mwrap wraps all malloc-family calls to trace the Ruby source location of such calls and bytes allocated at each callsite. As of mwrap 2.0.0, it can also function as a leak detector and show live allocations at every call site. Depending on your application and workload, the overhead is roughly a 50% increase memory and runtime. It works best for allocations under GVL, but tries to track numeric caller addresses for allocations made without GVL so you can get an idea of how much memory usage certain extensions and native libraries use. It requires the concurrent lock-free hash table from the Userspace RCU project: https://liburcu.org/ It does not require recompiling or rebuilding Ruby, but only supports Ruby trunk (2.6.0dev+) on a few platforms: * GNU/Linux * FreeBSD (tested 11.1) It may work on NetBSD, OpenBSD and DragonFly BSD. Mailing list and archives: https://80x24.org/mwrap-public/ nntp://80x24.org/inbox.comp.lang.ruby.mwrap mailto:firstname.lastname@example.org (no HTML mail, please) Note: I might not be able answer questions about this for a few days. git clone https://80x24.org/mwrap.git homepage + rdoc: https://80x24.org/mwrap/
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