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README
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README
@ -17,4 +17,4 @@ jemalloc.
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The ChangeLog file contains a brief summary of changes for each release.
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URL: http://jemalloc.net/
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URL: https://jemalloc.net/
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26
TUNING.md
26
TUNING.md
@ -11,9 +11,9 @@ by a few percent, or make favorable trade-offs.
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## Notable runtime options for performance tuning
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Runtime options can be set via
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[malloc_conf](http://jemalloc.net/jemalloc.3.html#tuning).
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[malloc_conf](https://jemalloc.net/jemalloc.3.html#tuning).
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* [background_thread](http://jemalloc.net/jemalloc.3.html#background_thread)
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* [background_thread](https://jemalloc.net/jemalloc.3.html#background_thread)
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Enabling jemalloc background threads generally improves the tail latency for
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application threads, since unused memory purging is shifted to the dedicated
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@ -23,7 +23,7 @@ Runtime options can be set via
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Suggested: `background_thread:true` when jemalloc managed threads can be
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allowed.
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* [metadata_thp](http://jemalloc.net/jemalloc.3.html#opt.metadata_thp)
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* [metadata_thp](https://jemalloc.net/jemalloc.3.html#opt.metadata_thp)
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Allowing jemalloc to utilize transparent huge pages for its internal
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metadata usually reduces TLB misses significantly, especially for programs
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@ -35,8 +35,8 @@ Runtime options can be set via
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`metadata_thp:always`, which is expected to improve CPU utilization at a
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small memory cost.
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* [dirty_decay_ms](http://jemalloc.net/jemalloc.3.html#opt.dirty_decay_ms) and
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[muzzy_decay_ms](http://jemalloc.net/jemalloc.3.html#opt.muzzy_decay_ms)
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* [dirty_decay_ms](https://jemalloc.net/jemalloc.3.html#opt.dirty_decay_ms) and
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[muzzy_decay_ms](https://jemalloc.net/jemalloc.3.html#opt.muzzy_decay_ms)
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Decay time determines how fast jemalloc returns unused pages back to the
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operating system, and therefore provides a fairly straightforward trade-off
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@ -46,7 +46,7 @@ Runtime options can be set via
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Suggested: tune the values based on the desired trade-offs.
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* [narenas](http://jemalloc.net/jemalloc.3.html#opt.narenas)
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* [narenas](https://jemalloc.net/jemalloc.3.html#opt.narenas)
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By default jemalloc uses multiple arenas to reduce internal lock contention.
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However high arena count may also increase overall memory fragmentation,
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@ -57,7 +57,7 @@ Runtime options can be set via
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Suggested: if low parallelism is expected, try lower arena count while
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monitoring CPU and memory usage.
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* [percpu_arena](http://jemalloc.net/jemalloc.3.html#opt.percpu_arena)
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* [percpu_arena](https://jemalloc.net/jemalloc.3.html#opt.percpu_arena)
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Enable dynamic thread to arena association based on running CPU. This has
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the potential to improve locality, e.g. when thread to CPU affinity is
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@ -100,28 +100,28 @@ aborts immediately on illegal options.
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In addition to the runtime options, there are a number of programmatic ways to
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improve application performance with jemalloc.
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* [Explicit arenas](http://jemalloc.net/jemalloc.3.html#arenas.create)
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* [Explicit arenas](https://jemalloc.net/jemalloc.3.html#arenas.create)
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Manually created arenas can help performance in various ways, e.g. by
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managing locality and contention for specific usages. For example,
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applications can explicitly allocate frequently accessed objects from a
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dedicated arena with
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[mallocx()](http://jemalloc.net/jemalloc.3.html#MALLOCX_ARENA) to improve
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[mallocx()](https://jemalloc.net/jemalloc.3.html#MALLOCX_ARENA) to improve
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locality. In addition, explicit arenas often benefit from individually
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tuned options, e.g. relaxed [decay
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time](http://jemalloc.net/jemalloc.3.html#arena.i.dirty_decay_ms) if
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time](https://jemalloc.net/jemalloc.3.html#arena.i.dirty_decay_ms) if
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frequent reuse is expected.
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* [Extent hooks](http://jemalloc.net/jemalloc.3.html#arena.i.extent_hooks)
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* [Extent hooks](https://jemalloc.net/jemalloc.3.html#arena.i.extent_hooks)
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Extent hooks allow customization for managing underlying memory. One use
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case for performance purpose is to utilize huge pages -- for example,
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[HHVM](https://github.com/facebook/hhvm/blob/master/hphp/util/alloc.cpp)
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[HHVM](httpss://github.com/facebook/hhvm/blob/master/hphp/util/alloc.cpp)
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uses explicit arenas with customized extent hooks to manage 1GB huge pages
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for frequently accessed data, which reduces TLB misses significantly.
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* [Explicit thread-to-arena
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binding](http://jemalloc.net/jemalloc.3.html#thread.arena)
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binding](https://jemalloc.net/jemalloc.3.html#thread.arena)
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It is common for some threads in an application to have different memory
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access / allocation patterns. Threads with heavy workloads often benefit
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@ -6,7 +6,7 @@ install_suffix=@install_suffix@
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Name: jemalloc
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Description: A general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support.
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URL: http://jemalloc.net/
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URL: https://jemalloc.net/
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Version: @jemalloc_version_major@.@jemalloc_version_minor@.@jemalloc_version_bugfix@_@jemalloc_version_nrev@
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Cflags: -I${includedir}
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Libs: -L${libdir} -ljemalloc${install_suffix}
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