== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 05:09:51 (1775207391)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.7785 s, 8.2 MB/s
llite.lustre-ffff89dac6190800.read_ahead_stats=clear
llite.lustre-ffff89dac6190800.read_ahead_stats=
snapshot_time             1775207422.227166972 secs.nsecs
start_time                1775207409.668700876 secs.nsecs
elapsed_time              12.558466096 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          5 samples [pages]
async_readahead           2 samples [pages]
failed_to_fast_read       36 samples [pages]
mmap_range_read           28 samples [pages]
readahead_pages           35 samples [pages] 8 4096 25567
/usr/bin/fio
thp                     : Memory Advise Huge Page
read_test: (g=0): rw=read, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=mmap, iodepth=1
fio-3.19
Starting 1 process

read_test: (groupid=0, jobs=1): err= 0: pid=292985: Fri Apr  3 05:29:21 2026
  read: IOPS=4, BW=4649KiB/s (4761kB/s)(5120MiB/1127700msec)
    clat (msec): min=33, max=752, avg=219.54, stdev=57.42
     lat (msec): min=33, max=752, avg=219.54, stdev=57.42
    clat percentiles (msec):
     |  1.00th=[  109],  5.00th=[  140], 10.00th=[  157], 20.00th=[  176],
     | 30.00th=[  188], 40.00th=[  201], 50.00th=[  213], 60.00th=[  228],
     | 70.00th=[  243], 80.00th=[  259], 90.00th=[  288], 95.00th=[  326],
     | 99.00th=[  388], 99.50th=[  414], 99.90th=[  550], 99.95th=[  609],
     | 99.99th=[  751]
   bw (  KiB/s): min= 1892, max=10219, per=100.00%, avg=4669.52, stdev=1277.45, samples=2231
   iops        : min=    1, max=    9, avg= 3.84, stdev= 1.33, samples=2231
  lat (msec)   : 50=0.06%, 100=0.59%, 250=74.14%, 500=25.10%, 750=0.10%
  lat (msec)   : 1000=0.02%
  cpu          : usr=0.31%, sys=28.02%, ctx=34559, majf=5505, minf=1305484
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwts: total=5120,0,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
   READ: bw=4649KiB/s (4761kB/s), 4649KiB/s-4649KiB/s (4761kB/s-4761kB/s), io=5120MiB (5369MB), run=1127700-1127700msec