aclamk

0  998 ip=55836432d798
  558363b379b0 crc32_iscsi_00 30 ip=9a9
  7f13cf2dd511 #### 1 ip=ffffffffffffffff
    7f13d367e730 _ZN8tcmalloc15CentralFreeList17FetchFromOneSpansEiPPvS2_ 1 ip=2f
  7f13cf2dd811 #### 1 ip=ffffffffffffffff
    7f13d367f620 _ZN8tcmalloc8PageHeap10AllocLargeEm 1 ip=87
  7f13cf2ddaf1 #### 1 ip=ffffffffffffffff
    5583633195e0 _ZN4ceph6buffer4list5clearEv 1 ip=17
  7f13cf2e1701 #### 1 ip=ffffffffffffffff
    558363969b60 _ZN11EventCenter14process_eventsEiPNSt6chrono8durationImSt5ratioILl1ELl1000000000EEEE 1 ip=569

aclamk

Thread: 21319 (ceph-osd) - 19934 samples, time suspended=1385ms

+ 100.00% _start
  + 100.00% __libc_start_main
    + 100.00% main
      + 100.00% AsyncMessenger::wait()
        + 100.00% pthread_cond_wait

Thread: 21320 (log) - 19934 samples, time suspended=1362ms

aclamk

Thread: 1 (ceph-osd) - 218 samples 

+ 100.00% main
  + 100.00% AsyncMessenger::wait
    + 100.00% Wait
      + 100.00% pthread_cond_wait@@GLIBC_2.3.2

Thread: 2 (signal_handler) - 218 samples 

aclamk

#include <assert.h>
#include <inttypes.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>

typedef uint64_t slot_t;
static constexpr size_t bits_per_slot = sizeof(slot_t) * 8;

static inline ssize_t count_0s_gcc(slot_t slot_val, size_t start_pos)

aclamk

** REFERENCE **

Note: Google Test filter = Log.Multithread*
[==========] Running 5 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 5 tests from Log
[ RUN      ] Log.Multithread
[       OK ] Log.Multithread (1176 ms)
[ RUN      ] Log.Multithread_4_4K_10000
[       OK ] Log.Multithread_4_4K_10000 (978 ms)

aclamk

Encode when all fields are encoded to bytestream

[ RUN      ] BufferList.encode_bench
[       OK ] BufferList.encode_bench (251 ms)
[ RUN      ] BufferList.encode_bench_x
[       OK ] BufferList.encode_bench_x (31 ms)



Encode when one of fields is bufferlist and its data is not copied

aclamk

Reference:
[
    {
        "name": "void OSDMap::encode(ceph::bufferlist&, uint64_t) const",
        "count": 8,
        "time": "0.001130",
        "one": "0.000141"
    },
    {
        "name": "void object_info_t::encode(ceph::bufferlist&, uint64_t) const",

aclamk

"rbd_data.293a2176813d67.0000000000000688",
        "device": {
            "0xc0af0000": "0x4000",
            "0xc0af4000": "0x10000",
            "0xc0b04000": "0x10000",
            "0xc0b14000": "0x10000",
            "0xc0b24000": "0x10000",
            "0xc0b34000": "0x10000",
            "0xc0b44000": "0x10000",
            "0xc0b54000": "0x10000",

aclamk

#if BLI_OLD
      unsigned off; // in bl
      list_iter_t p;
      unsigned p_off;   // in *p
#endif
#if BLI_NEW
      mutable const char* current;
      mutable const char* limit;
      list_iter_t pp;
      mutable unsigned off_anchor;

aclamk

prefix_cf:
1) there exists default table for k-v 
2) there exist additional tables with fixed prefixes
3) for additional table name is same as prefix
4) writes and reads do refer additional table, if prefix matches
5) prefixed iterator accesses either default or prefixed table
6) wholespace iterator accesses default_cf
7*) need uniform iterator for both prefixed and default