== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 22:18:59 (1767323939)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.77467 s, 18.2 MB/s
llite.lustre-ffff9cf106841800.read_ahead_stats=clear
llite.lustre-ffff9cf106841800.read_ahead_stats=
snapshot_time             1767323955.001566840 secs.nsecs
start_time                1767323947.169853283 secs.nsecs
elapsed_time              7.831713557 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          14 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=228603: Thu Jan  1 22:25:39 2026
  read: IOPS=13, BW=13.4MiB/s (14.1MB/s)(5120MiB/381305msec)
    clat (msec): min=17, max=204, avg=74.25, stdev=24.07
     lat (msec): min=17, max=204, avg=74.25, stdev=24.07
    clat percentiles (msec):
     |  1.00th=[   48],  5.00th=[   54], 10.00th=[   56], 20.00th=[   58],
     | 30.00th=[   60], 40.00th=[   62], 50.00th=[   65], 60.00th=[   68],
     | 70.00th=[   73], 80.00th=[   90], 90.00th=[  117], 95.00th=[  126],
     | 99.00th=[  142], 99.50th=[  153], 99.90th=[  169], 99.95th=[  192],
     | 99.99th=[  205]
   bw (  KiB/s): min= 6131, max=20480, per=100.00%, avg=13805.00, stdev=3738.34, samples=758
   iops        : min=    5, max=   20, avg=13.14, stdev= 3.69, samples=758
  lat (msec)   : 20=0.02%, 50=2.15%, 100=79.59%, 250=18.24%
  cpu          : usr=0.69%, sys=70.87%, ctx=15128, majf=5853, minf=1305135
  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=13.4MiB/s (14.1MB/s), 13.4MiB/s-13.4MiB/s (14.1MB/s-14.1MB/s), io=5120MiB (5369MB), run=381305-381305msec