== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 21:50:08 (1768013408)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.31263 s, 16.6 MB/s
llite.lustre-ffff97dea07ef000.read_ahead_stats=clear
llite.lustre-ffff97dea07ef000.read_ahead_stats=
snapshot_time             1768013421.691826725 secs.nsecs
start_time                1768013416.740785672 secs.nsecs
elapsed_time              4.951041053 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=296366: Fri Jan  9 21:56:04 2026
  read: IOPS=15, BW=15.1MiB/s (15.8MB/s)(5120MiB/339518msec)
    clat (msec): min=37, max=254, avg=66.14, stdev=27.55
     lat (msec): min=37, max=254, avg=66.14, stdev=27.55
    clat percentiles (msec):
     |  1.00th=[   40],  5.00th=[   47], 10.00th=[   48], 20.00th=[   49],
     | 30.00th=[   50], 40.00th=[   51], 50.00th=[   53], 60.00th=[   55],
     | 70.00th=[   61], 80.00th=[  106], 90.00th=[  115], 95.00th=[  121],
     | 99.00th=[  133], 99.50th=[  138], 99.90th=[  209], 99.95th=[  224],
     | 99.99th=[  255]
   bw (  KiB/s): min= 4096, max=24576, per=100.00%, avg=15484.00, stdev=5420.46, samples=676
   iops        : min=    4, max=   24, avg=15.11, stdev= 5.30, samples=676
  lat (msec)   : 50=35.08%, 100=43.09%, 250=21.82%, 500=0.02%
  cpu          : usr=0.61%, sys=84.35%, ctx=11610, majf=5122, minf=1305866
  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=15.1MiB/s (15.8MB/s), 15.1MiB/s-15.1MiB/s (15.8MB/s-15.8MB/s), io=5120MiB (5369MB), run=339518-339518msec