== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 20:06:22 (1775865982)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.72548 s, 15.6 MB/s
llite.lustre-ffff951147188800.read_ahead_stats=clear
llite.lustre-ffff951147188800.read_ahead_stats=
snapshot_time             1775866005.363867671 secs.nsecs
start_time                1775865992.148027548 secs.nsecs
elapsed_time              13.215840123 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          12 samples [pages]
failed_to_reach_end       1 samples [pages]
failed_to_fast_read       230 samples [pages]
mmap_range_read           225 samples [pages]
readahead_pages           225 samples [pages] 8 128 25370
/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=238518: Fri Apr 10 20:17:08 2026
  read: IOPS=8, BW=8477KiB/s (8681kB/s)(5120MiB/618452msec)
    clat (msec): min=52, max=500, avg=120.51, stdev=47.06
     lat (msec): min=52, max=500, avg=120.51, stdev=47.06
    clat percentiles (msec):
     |  1.00th=[   65],  5.00th=[   70], 10.00th=[   73], 20.00th=[   79],
     | 30.00th=[   88], 40.00th=[  102], 50.00th=[  113], 60.00th=[  124],
     | 70.00th=[  136], 80.00th=[  150], 90.00th=[  182], 95.00th=[  211],
     | 99.00th=[  275], 99.50th=[  317], 99.90th=[  384], 99.95th=[  435],
     | 99.99th=[  502]
   bw (  KiB/s): min= 2023, max=16384, per=100.00%, avg=8507.52, stdev=3053.27, samples=1228
   iops        : min=    1, max=   16, avg= 7.80, stdev= 3.15, samples=1228
  lat (msec)   : 100=38.93%, 250=59.28%, 500=1.78%, 750=0.02%
  cpu          : usr=0.51%, sys=52.97%, ctx=20475, majf=5306, minf=1305680
  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=8477KiB/s (8681kB/s), 8477KiB/s-8477KiB/s (8681kB/s-8681kB/s), io=5120MiB (5369MB), run=618452-618452msec