== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 04:41:20 (1771407680)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.48335 s, 16.2 MB/s
llite.lustre-ffff8a2e4901a000.read_ahead_stats=clear
llite.lustre-ffff8a2e4901a000.read_ahead_stats=
snapshot_time             1771407696.257314030 secs.nsecs
start_time                1771407689.562890215 secs.nsecs
elapsed_time              6.694423815 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          6 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=292423: Wed Feb 18 04:53:53 2026
  read: IOPS=6, BW=7151KiB/s (7323kB/s)(5120MiB/733173msec)
    clat (msec): min=33, max=593, avg=142.93, stdev=60.19
     lat (msec): min=33, max=593, avg=142.93, stdev=60.19
    clat percentiles (msec):
     |  1.00th=[   68],  5.00th=[   75], 10.00th=[   80], 20.00th=[   88],
     | 30.00th=[   99], 40.00th=[  116], 50.00th=[  134], 60.00th=[  150],
     | 70.00th=[  167], 80.00th=[  188], 90.00th=[  220], 95.00th=[  251],
     | 99.00th=[  338], 99.50th=[  380], 99.90th=[  464], 99.95th=[  485],
     | 99.99th=[  592]
   bw (  KiB/s): min= 1996, max=16351, per=100.00%, avg=7172.48, stdev=2848.79, samples=1455
   iops        : min=    1, max=   15, avg= 6.42, stdev= 2.92, samples=1455
  lat (msec)   : 50=0.20%, 100=31.00%, 250=63.77%, 500=5.02%, 750=0.02%
  cpu          : usr=0.39%, sys=42.65%, ctx=23151, majf=5399, minf=1305591
  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=7151KiB/s (7323kB/s), 7151KiB/s-7151KiB/s (7323kB/s-7323kB/s), io=5120MiB (5369MB), run=733173-733173msec