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@jasone jasone released this 18 Apr 16:57
· 3274 commits to dev since this release
2.0.0
a39d5b6

This version focuses on the experimental *allocm() API, and on improved run-time configuration/introspection. Nonetheless, numerous performance improvements are also included.

New features:

  • Implement the experimental {,r,s,d}allocm() API, which provides a superset
    of the functionality available via malloc(), calloc(), posix_memalign(),
    realloc(), malloc_usable_size(), and free(). These functions can be used to
    allocate/reallocate aligned zeroed memory, ask for optional extra memory
    during reallocation, prevent object movement during reallocation, etc.
  • Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is
    more human-readable, and more flexible. For example:
    JEMALLOC_OPTIONS=AJP
    is now:
    MALLOC_CONF=abort:true,fill:true,stats_print:true
  • Port to Apple OS X. Sponsored by Mozilla.
  • Make it possible for the application to control thread-->arena mappings via
    the "thread.arena" mallctl.
  • Add compile-time support for all TLS-related functionality via pthreads TSD.
    This is mainly of interest for OS X, which does not support TLS, but has a
    TSD implementation with similar performance.
  • Override memalign() and valloc() if they are provided by the system.
  • Add the "arenas.purge" mallctl, which can be used to synchronously purge all
    dirty unused pages.
  • Make cumulative heap profiling data optional, so that it is possible to
    limit the amount of memory consumed by heap profiling data structures.
  • Add per thread allocation counters that can be accessed via the
    "thread.allocated" and "thread.deallocated" mallctls.

Incompatible changes:

  • Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above).
  • Increase default backtrace depth from 4 to 128 for heap profiling.
  • Disable interval-based profile dumps by default.

Bug fixes:

  • Remove bad assertions in fork handler functions. These assertions could
    cause aborts for some combinations of configure settings.
  • Fix strerror_r() usage to deal with non-standard semantics in GNU libc.
  • Fix leak context reporting. This bug tended to cause the number of contexts
    to be underreported (though the reported number of objects and bytes were
    correct).
  • Fix a realloc() bug for large in-place growing reallocation. This bug could
    cause memory corruption, but it was hard to trigger.
  • Fix an allocation bug for small allocations that could be triggered if
    multiple threads raced to create a new run of backing pages.
  • Enhance the heap profiler to trigger samples based on usable size, rather
    than request size.
  • Fix a heap profiling bug due to sometimes losing track of requested object
    size for sampled objects.
Assets 3