== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 07:04:15 (1768133055)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.52216 s, 19.0 MB/s
llite.lustre-ffff9bae033c1800.read_ahead_stats=clear
llite.lustre-ffff9bae033c1800.read_ahead_stats=
snapshot_time             1768133067.349888307 secs.nsecs
start_time                1768133062.695592702 secs.nsecs
elapsed_time              4.654295605 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=305022: Sun Jan 11 07:09:53 2026
  read: IOPS=15, BW=15.8MiB/s (16.6MB/s)(5120MiB/323549msec)
    clat (msec): min=36, max=186, avg=63.05, stdev=27.63
     lat (msec): min=36, max=186, avg=63.05, stdev=27.63
    clat percentiles (msec):
     |  1.00th=[   37],  5.00th=[   45], 10.00th=[   45], 20.00th=[   46],
     | 30.00th=[   46], 40.00th=[   47], 50.00th=[   47], 60.00th=[   49],
     | 70.00th=[   58], 80.00th=[  106], 90.00th=[  112], 95.00th=[  114],
     | 99.00th=[  116], 99.50th=[  120], 99.90th=[  157], 99.95th=[  167],
     | 99.99th=[  186]
   bw (  KiB/s): min= 8192, max=28672, per=100.00%, avg=16253.54, stdev=6230.27, samples=645
   iops        : min=    8, max=   28, avg=15.87, stdev= 6.08, samples=645
  lat (msec)   : 50=63.83%, 100=12.01%, 250=24.16%
  cpu          : usr=0.43%, sys=86.56%, ctx=11732, majf=5123, minf=1305864
  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=15.8MiB/s (16.6MB/s), 15.8MiB/s-15.8MiB/s (16.6MB/s-16.6MB/s), io=5120MiB (5369MB), run=323549-323549msec