== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 09:38:09 (1775137089)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.0606 s, 7.5 MB/s
llite.lustre-ffff995efa030800.read_ahead_stats=clear
llite.lustre-ffff995efa030800.read_ahead_stats=
snapshot_time             1775137124.077442672 secs.nsecs
start_time                1775137109.993540684 secs.nsecs
elapsed_time              14.083901988 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          5 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=292564: Thu Apr  2 09:56:50 2026
  read: IOPS=4, BW=4862KiB/s (4979kB/s)(5120MiB/1078282msec)
    clat (msec): min=28, max=689, avg=209.92, stdev=65.37
     lat (msec): min=28, max=689, avg=209.93, stdev=65.37
    clat percentiles (msec):
     |  1.00th=[   88],  5.00th=[  123], 10.00th=[  138], 20.00th=[  157],
     | 30.00th=[  174], 40.00th=[  188], 50.00th=[  203], 60.00th=[  218],
     | 70.00th=[  236], 80.00th=[  257], 90.00th=[  292], 95.00th=[  326],
     | 99.00th=[  409], 99.50th=[  464], 99.90th=[  558], 99.95th=[  600],
     | 99.99th=[  693]
   bw (  KiB/s): min= 1939, max=14138, per=100.00%, avg=4884.56, stdev=1504.51, samples=2131
   iops        : min=    1, max=   13, avg= 4.06, stdev= 1.55, samples=2131
  lat (msec)   : 50=0.10%, 100=1.89%, 250=74.96%, 500=22.83%, 750=0.21%
  cpu          : usr=0.29%, sys=27.65%, ctx=34171, majf=5552, minf=1305436
  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=4862KiB/s (4979kB/s), 4862KiB/s-4862KiB/s (4979kB/s-4979kB/s), io=5120MiB (5369MB), run=1078282-1078282msec