== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 17:52:50 (1775771570)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.696 s, 7.7 MB/s
llite.lustre-ffff978d671e7000.read_ahead_stats=clear
llite.lustre-ffff978d671e7000.read_ahead_stats=
snapshot_time             1775771606.249195832 secs.nsecs
start_time                1775771589.807244808 secs.nsecs
elapsed_time              16.441951024 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=291450: Thu Apr  9 18:12:20 2026
  read: IOPS=4, BW=4651KiB/s (4763kB/s)(5120MiB/1127274msec)
    clat (msec): min=28, max=630, avg=219.83, stdev=62.14
     lat (msec): min=28, max=630, avg=219.83, stdev=62.14
    clat percentiles (msec):
     |  1.00th=[   89],  5.00th=[  128], 10.00th=[  146], 20.00th=[  167],
     | 30.00th=[  186], 40.00th=[  201], 50.00th=[  215], 60.00th=[  232],
     | 70.00th=[  249], 80.00th=[  271], 90.00th=[  296], 95.00th=[  326],
     | 99.00th=[  388], 99.50th=[  409], 99.90th=[  456], 99.95th=[  493],
     | 99.99th=[  634]
   bw (  KiB/s): min= 1921, max=14307, per=100.00%, avg=4662.27, stdev=1429.21, samples=2230
   iops        : min=    1, max=   13, avg= 3.82, stdev= 1.48, samples=2230
  lat (msec)   : 50=0.14%, 100=1.76%, 250=68.85%, 500=29.22%, 750=0.04%
  cpu          : usr=0.27%, sys=26.04%, ctx=36203, majf=5536, minf=1305454
  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=4651KiB/s (4763kB/s), 4651KiB/s-4651KiB/s (4763kB/s-4763kB/s), io=5120MiB (5369MB), run=1127274-1127274msec