== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 20:57:09 (1768269429)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.8134 s, 13.4 MB/s
llite.lustre-ffff8a05b18dc800.read_ahead_stats=clear
llite.lustre-ffff8a05b18dc800.read_ahead_stats=
snapshot_time             1768269446.440447988 secs.nsecs
start_time                1768269440.409734669 secs.nsecs
elapsed_time              6.030713319 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=291502: Mon Jan 12 21:03:50 2026
  read: IOPS=13, BW=13.5MiB/s (14.2MB/s)(5120MiB/379303msec)
    clat (msec): min=13, max=2986, avg=73.75, stdev=111.40
     lat (msec): min=13, max=2986, avg=73.75, stdev=111.40
    clat percentiles (msec):
     |  1.00th=[   20],  5.00th=[   26], 10.00th=[   32], 20.00th=[   40],
     | 30.00th=[   46], 40.00th=[   52], 50.00th=[   58], 60.00th=[   65],
     | 70.00th=[   74], 80.00th=[   88], 90.00th=[  112], 95.00th=[  153],
     | 99.00th=[  300], 99.50th=[  359], 99.90th=[ 2140], 99.95th=[ 2601],
     | 99.99th=[ 3004]
   bw (  KiB/s): min= 1602, max=43574, per=100.00%, avg=14626.73, stdev=6389.76, samples=695
   iops        : min=    1, max=   42, avg=13.67, stdev= 6.30, samples=695
  lat (msec)   : 20=1.07%, 50=37.11%, 100=47.56%, 250=12.56%, 500=1.45%
  lat (msec)   : 750=0.02%, 2000=0.08%, >=2000=0.16%
  cpu          : usr=0.76%, sys=38.19%, ctx=28169, majf=579, minf=1310413
  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=13.5MiB/s (14.2MB/s), 13.5MiB/s-13.5MiB/s (14.2MB/s-14.2MB/s), io=5120MiB (5369MB), run=379303-379303msec