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Three changes to make pa_microbench easier to drive for fragmentation experiments: - Replace HPA_SHARD_OPTS_DEFAULT use with a single editable g_hpa_opts global. The microbench does not consult MALLOC_CONF for HPA shard opts, so this is the place to set the baseline configuration (slab_max_alloc, hugification_threshold, dirty_mult, hugify_delay_ms, purge_threshold, hugify_style, etc.). - Add -n/--nshards N to override the shard count derived from the trace. When set, each event is routed to (event->shard_ind % N), letting us study the impact of arena consolidation. Without the flag the behavior is unchanged (num_shards = max_shard_id + 1). - Bump MAX_ALLOCATIONS from 10M to 200M so the full ~50M-event adfinder trace (and similar) fits in the in-memory event buffer.
jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications. The COPYING file contains copyright and licensing information. The INSTALL file contains information on how to configure, build, and install jemalloc. The ChangeLog file contains a brief summary of changes for each release. URL: https://jemalloc.net/