== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 13:09:02 (1772474942)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.11893 s, 17.1 MB/s
llite.lustre-ffff934d02c23800.read_ahead_stats=clear
llite.lustre-ffff934d02c23800.read_ahead_stats=
snapshot_time             1772474955.968215410 secs.nsecs
start_time                1772474950.823992834 secs.nsecs
elapsed_time              5.144222576 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=294653: Mon Mar  2 13:13:50 2026
  read: IOPS=18, BW=18.9MiB/s (19.8MB/s)(5120MiB/270945msec)
    clat (msec): min=13, max=511, avg=52.70, stdev=24.51
     lat (msec): min=13, max=511, avg=52.70, stdev=24.51
    clat percentiles (msec):
     |  1.00th=[   23],  5.00th=[   31], 10.00th=[   35], 20.00th=[   40],
     | 30.00th=[   44], 40.00th=[   47], 50.00th=[   50], 60.00th=[   52],
     | 70.00th=[   54], 80.00th=[   59], 90.00th=[   72], 95.00th=[   90],
     | 99.00th=[  155], 99.50th=[  178], 99.90th=[  224], 99.95th=[  472],
     | 99.99th=[  510]
   bw (  KiB/s): min= 2048, max=38912, per=100.00%, avg=19414.39, stdev=4732.50, samples=525
   iops        : min=    2, max=   38, avg=18.62, stdev= 4.64, samples=525
  lat (msec)   : 20=0.59%, 50=51.17%, 100=44.51%, 250=3.65%, 500=0.04%
  lat (msec)   : 750=0.04%
  cpu          : usr=0.99%, sys=80.51%, ctx=25406, majf=271, minf=1310717
  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=18.9MiB/s (19.8MB/s), 18.9MiB/s-18.9MiB/s (19.8MB/s-19.8MB/s), io=5120MiB (5369MB), run=270945-270945msec