== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 13:25:04 (1772475904)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.20679 s, 16.9 MB/s
llite.lustre-ffff9ef4834de800.read_ahead_stats=clear
llite.lustre-ffff9ef4834de800.read_ahead_stats=
snapshot_time             1772475918.043624324 secs.nsecs
start_time                1772475912.813308903 secs.nsecs
elapsed_time              5.230315421 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=297250: Mon Mar  2 13:31:15 2026
  read: IOPS=14, BW=14.4MiB/s (15.1MB/s)(5120MiB/354844msec)
    clat (msec): min=12, max=225, avg=69.12, stdev=26.40
     lat (msec): min=12, max=225, avg=69.12, stdev=26.40
    clat percentiles (msec):
     |  1.00th=[   43],  5.00th=[   48], 10.00th=[   50], 20.00th=[   53],
     | 30.00th=[   54], 40.00th=[   56], 50.00th=[   57], 60.00th=[   59],
     | 70.00th=[   63], 80.00th=[  106], 90.00th=[  115], 95.00th=[  121],
     | 99.00th=[  138], 99.50th=[  148], 99.90th=[  167], 99.95th=[  203],
     | 99.99th=[  226]
   bw (  KiB/s): min= 6119, max=22528, per=100.00%, avg=14816.14, stdev=4830.84, samples=707
   iops        : min=    5, max=   22, avg=14.36, stdev= 4.73, samples=707
  lat (msec)   : 20=0.08%, 50=10.78%, 100=66.99%, 250=22.15%
  cpu          : usr=0.68%, sys=82.44%, ctx=11847, majf=5213, minf=1305776
  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=14.4MiB/s (15.1MB/s), 14.4MiB/s-14.4MiB/s (15.1MB/s-15.1MB/s), io=5120MiB (5369MB), run=354844-354844msec