== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 03:57:41 (1771405061)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.1712 s, 10.3 MB/s
llite.lustre-ffff90032ae18800.read_ahead_stats=clear
llite.lustre-ffff90032ae18800.read_ahead_stats=
snapshot_time             1771405098.934983013 secs.nsecs
start_time                1771405077.109094868 secs.nsecs
elapsed_time              21.825888145 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          19 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=225844: Wed Feb 18 04:12:31 2026
  read: IOPS=6, BW=6200KiB/s (6348kB/s)(5120MiB/845689msec)
    clat (msec): min=64, max=379, avg=164.70, stdev=42.04
     lat (msec): min=64, max=379, avg=164.71, stdev=42.04
    clat percentiles (msec):
     |  1.00th=[   95],  5.00th=[  111], 10.00th=[  122], 20.00th=[  132],
     | 30.00th=[  140], 40.00th=[  146], 50.00th=[  157], 60.00th=[  167],
     | 70.00th=[  180], 80.00th=[  197], 90.00th=[  222], 95.00th=[  245],
     | 99.00th=[  296], 99.50th=[  317], 99.90th=[  351], 99.95th=[  368],
     | 99.99th=[  380]
   bw (  KiB/s): min= 2023, max=10240, per=100.00%, avg=6220.23, stdev=1492.82, samples=1673
   iops        : min=    1, max=   10, avg= 5.42, stdev= 1.56, samples=1673
  lat (msec)   : 100=1.97%, 250=93.77%, 500=4.26%
  cpu          : usr=0.36%, sys=35.26%, ctx=29917, majf=5459, minf=1305528
  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=6200KiB/s (6348kB/s), 6200KiB/s-6200KiB/s (6348kB/s-6348kB/s), io=5120MiB (5369MB), run=845689-845689msec