== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 08:01:15 (1769086875)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.50289 s, 16.1 MB/s
llite.lustre-ffff97262b0c7800.read_ahead_stats=clear
llite.lustre-ffff97262b0c7800.read_ahead_stats=
snapshot_time             1769086889.336174019 secs.nsecs
start_time                1769086883.931330767 secs.nsecs
elapsed_time              5.404843252 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          3 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=293051: Thu Jan 22 08:07:25 2026
  read: IOPS=14, BW=14.5MiB/s (15.2MB/s)(5120MiB/353180msec)
    clat (msec): min=9, max=224, avg=68.79, stdev=31.71
     lat (msec): min=9, max=224, avg=68.79, stdev=31.71
    clat percentiles (msec):
     |  1.00th=[   39],  5.00th=[   45], 10.00th=[   46], 20.00th=[   49],
     | 30.00th=[   51], 40.00th=[   53], 50.00th=[   56], 60.00th=[   59],
     | 70.00th=[   64], 80.00th=[  100], 90.00th=[  115], 95.00th=[  140],
     | 99.00th=[  176], 99.50th=[  184], 99.90th=[  197], 99.95th=[  199],
     | 99.99th=[  226]
   bw (  KiB/s): min= 4096, max=22528, per=100.00%, avg=14887.92, stdev=5547.71, samples=704
   iops        : min=    4, max=   22, avg=14.51, stdev= 5.42, samples=704
  lat (msec)   : 10=0.02%, 50=27.83%, 100=53.24%, 250=18.91%
  cpu          : usr=0.74%, sys=83.78%, ctx=11494, majf=5136, minf=1305851
  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=14.5MiB/s (15.2MB/s), 14.5MiB/s-14.5MiB/s (15.2MB/s-15.2MB/s), io=5120MiB (5369MB), run=353180-353180msec