== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 20:36:30 (1775867790)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.6245 s, 9.0 MB/s
llite.lustre-ffff9555ee0d7000.read_ahead_stats=clear
llite.lustre-ffff9555ee0d7000.read_ahead_stats=
snapshot_time             1775867822.543866472 secs.nsecs
start_time                1775867807.997381245 secs.nsecs
elapsed_time              14.546485227 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=300548: Fri Apr 10 20:54:29 2026
  read: IOPS=4, BW=5050KiB/s (5171kB/s)(5120MiB/1038175msec)
    clat (msec): min=32, max=867, avg=202.24, stdev=63.13
     lat (msec): min=32, max=867, avg=202.25, stdev=63.13
    clat percentiles (msec):
     |  1.00th=[   91],  5.00th=[  116], 10.00th=[  132], 20.00th=[  153],
     | 30.00th=[  167], 40.00th=[  182], 50.00th=[  194], 60.00th=[  209],
     | 70.00th=[  226], 80.00th=[  247], 90.00th=[  279], 95.00th=[  313],
     | 99.00th=[  397], 99.50th=[  439], 99.90th=[  542], 99.95th=[  600],
     | 99.99th=[  869]
   bw (  KiB/s): min= 1875, max=10240, per=100.00%, avg=5073.56, stdev=1515.78, samples=2053
   iops        : min=    1, max=   10, avg= 4.26, stdev= 1.59, samples=2053
  lat (msec)   : 50=0.16%, 100=1.82%, 250=79.36%, 500=18.46%, 750=0.20%
  lat (msec)   : 1000=0.02%
  cpu          : usr=0.30%, sys=29.71%, ctx=32417, majf=5531, minf=1305458
  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=5050KiB/s (5171kB/s), 5050KiB/s-5050KiB/s (5171kB/s-5171kB/s), io=5120MiB (5369MB), run=1038175-1038175msec