== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 01:35:04 (1769063704)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.74713 s, 15.5 MB/s
llite.lustre-ffff95ba8644c800.read_ahead_stats=clear
llite.lustre-ffff95ba8644c800.read_ahead_stats=
snapshot_time             1769063726.209670815 secs.nsecs
start_time                1769063714.292144372 secs.nsecs
elapsed_time              11.917526443 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          38 samples [pages]
failed_to_reach_end       1 samples [pages]
failed_to_fast_read       230 samples [pages]
mmap_range_read           225 samples [pages]
readahead_pages           225 samples [pages] 8 128 25370
/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=225058: Thu Jan 22 01:43:56 2026
  read: IOPS=10, BW=10.1MiB/s (10.6MB/s)(5120MiB/504580msec)
    clat (msec): min=19, max=251, avg=98.20, stdev=26.87
     lat (msec): min=19, max=251, avg=98.20, stdev=26.87
    clat percentiles (msec):
     |  1.00th=[   57],  5.00th=[   65], 10.00th=[   69], 20.00th=[   77],
     | 30.00th=[   83], 40.00th=[   88], 50.00th=[   93], 60.00th=[  100],
     | 70.00th=[  108], 80.00th=[  117], 90.00th=[  136], 95.00th=[  150],
     | 99.00th=[  182], 99.50th=[  194], 99.90th=[  218], 99.95th=[  232],
     | 99.99th=[  251]
   bw (  KiB/s): min= 4096, max=18432, per=100.00%, avg=10436.17, stdev=2303.66, samples=1000
   iops        : min=    4, max=   18, avg= 9.63, stdev= 2.33, samples=1000
  lat (msec)   : 20=0.02%, 50=0.16%, 100=60.98%, 250=38.83%, 500=0.02%
  cpu          : usr=0.54%, sys=44.83%, ctx=20907, majf=6538, minf=1304451
  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=10.1MiB/s (10.6MB/s), 10.1MiB/s-10.1MiB/s (10.6MB/s-10.6MB/s), io=5120MiB (5369MB), run=504580-504580msec