== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 00:23:42 (1764739422)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.32596 s, 16.6 MB/s
llite.lustre-ffff9c82881cd000.read_ahead_stats=clear
llite.lustre-ffff9c82881cd000.read_ahead_stats=
snapshot_time             1764739436.197421506 secs.nsecs
start_time                1764739430.954370452 secs.nsecs
elapsed_time              5.243051054 secs.nsecs
hits                      25474 samples [pages]
misses                    126 samples [pages]
failed_grab_cache_page    16 samples [pages]
zero_size_window          3 samples [pages]
failed_to_reach_end       108 samples [pages]
failed_to_fast_read       128 samples [pages]
mmap_range_read           121 samples [pages]
readahead_pages           20 samples [pages] 8 12288 25474
/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=304871: Wed Dec  3 00:30:05 2025
  read: IOPS=13, BW=13.0MiB/s (14.7MB/s)(5120MiB/365792msec)
    clat (msec): min=33, max=226, avg=71.26, stdev=28.86
     lat (msec): min=33, max=226, avg=71.26, stdev=28.86
    clat percentiles (msec):
     |  1.00th=[   41],  5.00th=[   46], 10.00th=[   50], 20.00th=[   53],
     | 30.00th=[   55], 40.00th=[   57], 50.00th=[   59], 60.00th=[   63],
     | 70.00th=[   68], 80.00th=[  101], 90.00th=[  118], 95.00th=[  129],
     | 99.00th=[  161], 99.50th=[  188], 99.90th=[  209], 99.95th=[  213],
     | 99.99th=[  226]
   bw (  KiB/s): min= 4096, max=24576, per=100.00%, avg=14371.82, stdev=4867.43, samples=729
   iops        : min=    4, max=   24, avg=14.02, stdev= 4.75, samples=729
  lat (msec)   : 50=12.62%, 100=67.13%, 250=20.25%
  cpu          : usr=0.68%, sys=84.75%, ctx=11796, majf=5123, minf=1305865
  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=13.0MiB/s (14.7MB/s), 13.0MiB/s-13.0MiB/s (14.7MB/s-14.7MB/s), io=5120MiB (5369MB), run=365792-365792msec