== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 05:21:32 (1768558892)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 15.3558 s, 6.8 MB/s
llite.lustre-ffff9245431ae000.read_ahead_stats=clear
llite.lustre-ffff9245431ae000.read_ahead_stats=
snapshot_time             1768558927.119777151 secs.nsecs
start_time                1768558915.822807991 secs.nsecs
elapsed_time              11.296969160 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          5 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=295492: Fri Jan 16 05:30:08 2026
  read: IOPS=10, BW=10.8MiB/s (11.4MB/s)(5120MiB/472758msec)
    clat (msec): min=14, max=3719, avg=91.63, stdev=174.37
     lat (msec): min=14, max=3719, avg=91.63, stdev=174.37
    clat percentiles (msec):
     |  1.00th=[   23],  5.00th=[   30], 10.00th=[   37], 20.00th=[   48],
     | 30.00th=[   56], 40.00th=[   64], 50.00th=[   71], 60.00th=[   80],
     | 70.00th=[   90], 80.00th=[  106], 90.00th=[  136], 95.00th=[  178],
     | 99.00th=[  284], 99.50th=[  460], 99.90th=[ 3104], 99.95th=[ 3440],
     | 99.99th=[ 3708]
   bw (  KiB/s): min= 1812, max=34335, per=100.00%, avg=12420.81, stdev=5067.41, samples=819
   iops        : min=    1, max=   33, avg=11.45, stdev= 4.99, samples=819
  lat (msec)   : 20=0.47%, 50=21.95%, 100=55.04%, 250=21.25%, 500=0.80%
  lat (msec)   : 1000=0.02%, 2000=0.14%, >=2000=0.33%
  cpu          : usr=0.64%, sys=28.98%, ctx=32034, majf=545, minf=1310444
  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=10.8MiB/s (11.4MB/s), 10.8MiB/s-10.8MiB/s (11.4MB/s-11.4MB/s), io=5120MiB (5369MB), run=472758-472758msec