== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 20:07:35 (1773619655)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 8.17387 s, 12.8 MB/s
llite.lustre-ffff8e84396cb800.read_ahead_stats=clear
llite.lustre-ffff8e84396cb800.read_ahead_stats=
snapshot_time             1773619674.243474810 secs.nsecs
start_time                1773619665.883387498 secs.nsecs
elapsed_time              8.360087312 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=292097: Sun Mar 15 20:16:14 2026
  read: IOPS=10, BW=10.3MiB/s (10.8MB/s)(5120MiB/496343msec)
    clat (msec): min=47, max=313, avg=96.70, stdev=41.74
     lat (msec): min=47, max=313, avg=96.70, stdev=41.74
    clat percentiles (msec):
     |  1.00th=[   58],  5.00th=[   64], 10.00th=[   67], 20.00th=[   71],
     | 30.00th=[   74], 40.00th=[   78], 50.00th=[   82], 60.00th=[   85],
     | 70.00th=[   90], 80.00th=[  102], 90.00th=[  171], 95.00th=[  186],
     | 99.00th=[  243], 99.50th=[  266], 99.90th=[  284], 99.95th=[  300],
     | 99.99th=[  313]
   bw (  KiB/s): min= 2048, max=18432, per=100.00%, avg=10597.76, stdev=3729.18, samples=988
   iops        : min=    2, max=   18, avg=10.26, stdev= 3.67, samples=988
  lat (msec)   : 50=0.02%, 100=79.71%, 250=19.51%, 500=0.76%
  cpu          : usr=0.61%, sys=86.63%, ctx=12191, majf=5128, minf=1305859
  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=10.3MiB/s (10.8MB/s), 10.3MiB/s-10.3MiB/s (10.8MB/s-10.8MB/s), io=5120MiB (5369MB), run=496343-496343msec