== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 22:41:20 (1767325280)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.82319 s, 18.0 MB/s
llite.lustre-ffff9814fa70c000.read_ahead_stats=clear
llite.lustre-ffff9814fa70c000.read_ahead_stats=
snapshot_time             1767325292.701013646 secs.nsecs
start_time                1767325288.130035085 secs.nsecs
elapsed_time              4.570978561 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=296237: Thu Jan  1 22:47:16 2026
  read: IOPS=15, BW=15.0MiB/s (15.8MB/s)(5120MiB/340849msec)
    clat (msec): min=13, max=307, avg=66.39, stdev=25.89
     lat (msec): min=13, max=307, avg=66.39, stdev=25.89
    clat percentiles (msec):
     |  1.00th=[   41],  5.00th=[   46], 10.00th=[   47], 20.00th=[   50],
     | 30.00th=[   52], 40.00th=[   53], 50.00th=[   55], 60.00th=[   57],
     | 70.00th=[   60], 80.00th=[  103], 90.00th=[  111], 95.00th=[  116],
     | 99.00th=[  127], 99.50th=[  142], 99.90th=[  184], 99.95th=[  194],
     | 99.99th=[  309]
   bw (  KiB/s): min= 4096, max=22528, per=100.00%, avg=15425.61, stdev=5124.11, samples=679
   iops        : min=    4, max=   22, avg=15.03, stdev= 5.02, samples=679
  lat (msec)   : 20=0.04%, 50=23.85%, 100=54.92%, 250=21.17%, 500=0.02%
  cpu          : usr=0.67%, sys=83.26%, ctx=11644, majf=5157, minf=1305832
  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=15.0MiB/s (15.8MB/s), 15.0MiB/s-15.0MiB/s (15.8MB/s-15.8MB/s), io=5120MiB (5369MB), run=340849-340849msec