== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 19:03:33 (1775171013)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 4.98352 s, 21.0 MB/s
llite.lustre-ffff8b96a05a4800.read_ahead_stats=clear
llite.lustre-ffff8b96a05a4800.read_ahead_stats=
snapshot_time             1775171027.572943515 secs.nsecs
start_time                1775171020.289308832 secs.nsecs
elapsed_time              7.283634683 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          4 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=231116: Thu Apr  2 19:10:27 2026
  read: IOPS=12, BW=12.9MiB/s (13.5MB/s)(5120MiB/397147msec)
    clat (msec): min=41, max=236, avg=77.41, stdev=33.21
     lat (msec): min=41, max=236, avg=77.41, stdev=33.21
    clat percentiles (msec):
     |  1.00th=[   50],  5.00th=[   53], 10.00th=[   56], 20.00th=[   59],
     | 30.00th=[   61], 40.00th=[   63], 50.00th=[   65], 60.00th=[   67],
     | 70.00th=[   70], 80.00th=[   79], 90.00th=[  132], 95.00th=[  146],
     | 99.00th=[  205], 99.50th=[  213], 99.90th=[  222], 99.95th=[  230],
     | 99.99th=[  236]
   bw (  KiB/s): min= 4096, max=22528, per=100.00%, avg=13236.53, stdev=4522.22, samples=792
   iops        : min=    4, max=   22, avg=12.91, stdev= 4.42, samples=792
  lat (msec)   : 50=1.50%, 100=79.94%, 250=18.55%
  cpu          : usr=0.62%, sys=87.38%, ctx=13247, majf=5120, minf=1305870
  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=12.9MiB/s (13.5MB/s), 12.9MiB/s-12.9MiB/s (13.5MB/s-13.5MB/s), io=5120MiB (5369MB), run=397147-397147msec