== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 12:23:59 (1774887839)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.7549 s, 7.6 MB/s
llite.lustre-ffff8907d171f800.read_ahead_stats=clear
llite.lustre-ffff8907d171f800.read_ahead_stats=
snapshot_time             1774887877.159579703 secs.nsecs
start_time                1774887860.374562798 secs.nsecs
elapsed_time              16.785016905 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=292621: Mon Mar 30 12:45:57 2026
  read: IOPS=4, BW=4132KiB/s (4231kB/s)(5120MiB/1268801msec)
    clat (msec): min=32, max=679, avg=247.08, stdev=68.23
     lat (msec): min=32, max=679, avg=247.08, stdev=68.23
    clat percentiles (msec):
     |  1.00th=[  106],  5.00th=[  144], 10.00th=[  163], 20.00th=[  190],
     | 30.00th=[  209], 40.00th=[  228], 50.00th=[  245], 60.00th=[  262],
     | 70.00th=[  279], 80.00th=[  300], 90.00th=[  334], 95.00th=[  363],
     | 99.00th=[  430], 99.50th=[  468], 99.90th=[  527], 99.95th=[  592],
     | 99.99th=[  676]
   bw (  KiB/s): min= 1917, max=10240, per=100.00%, avg=4150.12, stdev=1306.76, samples=2505
   iops        : min=    1, max=   10, avg= 3.31, stdev= 1.36, samples=2505
  lat (msec)   : 50=0.02%, 100=0.76%, 250=53.09%, 500=45.98%, 750=0.16%
  cpu          : usr=0.26%, sys=23.74%, ctx=39319, majf=5566, minf=1305423
  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=4132KiB/s (4231kB/s), 4132KiB/s-4132KiB/s (4231kB/s-4231kB/s), io=5120MiB (5369MB), run=1268801-1268801msec