Revision 33323f21117e5bb8cf72569302f109aabb387bb9 authored by Mark Callaghan on 14 September 2012, 19:35:02 UTC, committed by Mark Callaghan on 14 September 2012, 23:43:50 UTC
Summary: Reads via mmap on concurrent workloads are much slower than pread. For example on a 24-core server with storage that can do 100k IOPS or more I can get no more than 10k IOPS with mmap reads and 32+ threads. Test Plan: db_bench benchmarks Reviewers: dhruba, heyongqiang Reviewed By: heyongqiang Differential Revision: https://reviews.facebook.net/D5433
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| File | Mode | Size |
|---|---|---|
| arena.cc | -rw-r--r-- | 1.9 KB |
| arena.h | -rw-r--r-- | 1.8 KB |
| arena_test.cc | -rw-r--r-- | 1.6 KB |
| bloom.cc | -rw-r--r-- | 3.2 KB |
| bloom_test.cc | -rw-r--r-- | 3.6 KB |
| build_version.h | -rw-r--r-- | 376 bytes |
| cache.cc | -rw-r--r-- | 9.1 KB |
| cache_test.cc | -rw-r--r-- | 4.6 KB |
| coding.cc | -rw-r--r-- | 4.8 KB |
| coding.h | -rw-r--r-- | 4.0 KB |
| coding_test.cc | -rw-r--r-- | 5.4 KB |
| comparator.cc | -rw-r--r-- | 2.1 KB |
| crc32c.cc | -rw-r--r-- | 15.0 KB |
| crc32c.h | -rw-r--r-- | 1.4 KB |
| crc32c_test.cc | -rw-r--r-- | 1.7 KB |
| env.cc | -rw-r--r-- | 2.1 KB |
| env_hdfs.cc | -rw-r--r-- | 14.7 KB |
| env_posix.cc | -rw-r--r-- | 18.1 KB |
| env_test.cc | -rw-r--r-- | 2.5 KB |
| filelock_test.cc | -rw-r--r-- | 1.1 KB |
| filter_policy.cc | -rw-r--r-- | 333 bytes |
| hash.cc | -rw-r--r-- | 980 bytes |
| hash.h | -rw-r--r-- | 524 bytes |
| histogram.cc | -rw-r--r-- | 4.6 KB |
| histogram.h | -rw-r--r-- | 925 bytes |
| logging.cc | -rw-r--r-- | 1.8 KB |
| logging.h | -rw-r--r-- | 1.6 KB |
| mutexlock.h | -rw-r--r-- | 1023 bytes |
| options.cc | -rw-r--r-- | 3.7 KB |
| posix_logger.h | -rw-r--r-- | 2.7 KB |
| random.h | -rw-r--r-- | 2.0 KB |
| stats_logger.h | -rw-r--r-- | 658 bytes |
| status.cc | -rw-r--r-- | 1.9 KB |
| testharness.cc | -rw-r--r-- | 1.6 KB |
| testharness.h | -rw-r--r-- | 4.6 KB |
| testutil.cc | -rw-r--r-- | 1.4 KB |
| testutil.h | -rw-r--r-- | 1.7 KB |
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