== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 21:52:14 (1770691934)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.37859 s, 19.5 MB/s
llite.lustre-ffff915eb512b000.read_ahead_stats=clear
llite.lustre-ffff915eb512b000.read_ahead_stats=
snapshot_time             1770691945.914376832 secs.nsecs
start_time                1770691941.530441823 secs.nsecs
elapsed_time              4.383935009 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=291449: Mon Feb  9 21:58:39 2026
  read: IOPS=13, BW=13.8MiB/s (14.5MB/s)(5120MiB/370762msec)
    clat (msec): min=10, max=246, avg=72.23, stdev=33.56
     lat (msec): min=10, max=246, avg=72.23, stdev=33.56
    clat percentiles (msec):
     |  1.00th=[   42],  5.00th=[   45], 10.00th=[   48], 20.00th=[   51],
     | 30.00th=[   53], 40.00th=[   54], 50.00th=[   56], 60.00th=[   59],
     | 70.00th=[   66], 80.00th=[  114], 90.00th=[  124], 95.00th=[  133],
     | 99.00th=[  190], 99.50th=[  205], 99.90th=[  218], 99.95th=[  234],
     | 99.99th=[  247]
   bw (  KiB/s): min= 4096, max=24576, per=100.00%, avg=14180.49, stdev=5538.54, samples=739
   iops        : min=    4, max=   24, avg=13.84, stdev= 5.41, samples=739
  lat (msec)   : 20=0.02%, 50=19.06%, 100=56.31%, 250=24.61%
  cpu          : usr=0.65%, sys=85.44%, ctx=11647, majf=5125, minf=1305863
  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=13.8MiB/s (14.5MB/s), 13.8MiB/s-13.8MiB/s (14.5MB/s-14.5MB/s), io=5120MiB (5369MB), run=370762-370762msec