== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 13:10:33 (1776877833)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.66877 s, 18.5 MB/s
llite.lustre-ffff949a3162c000.read_ahead_stats=clear
llite.lustre-ffff949a3162c000.read_ahead_stats=
snapshot_time             1776877846.958087446 secs.nsecs
start_time                1776877840.703776843 secs.nsecs
elapsed_time              6.254310603 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=297501: Wed Apr 22 13:16:57 2026
  read: IOPS=13, BW=13.9MiB/s (14.6MB/s)(5120MiB/368060msec)
    clat (msec): min=46, max=279, avg=71.73, stdev=28.17
     lat (msec): min=46, max=279, avg=71.73, stdev=28.17
    clat percentiles (msec):
     |  1.00th=[   49],  5.00th=[   54], 10.00th=[   54], 20.00th=[   55],
     | 30.00th=[   56], 40.00th=[   57], 50.00th=[   59], 60.00th=[   63],
     | 70.00th=[   69], 80.00th=[   78], 90.00th=[  127], 95.00th=[  132],
     | 99.00th=[  148], 99.50th=[  174], 99.90th=[  226], 99.95th=[  230],
     | 99.99th=[  279]
   bw (  KiB/s): min= 4096, max=22528, per=100.00%, avg=14293.74, stdev=4480.05, samples=733
   iops        : min=    4, max=   22, avg=13.95, stdev= 4.38, samples=733
  lat (msec)   : 50=2.36%, 100=81.11%, 250=16.50%, 500=0.02%
  cpu          : usr=0.54%, sys=86.96%, ctx=11788, majf=5120, minf=1305869
  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=13.9MiB/s (14.6MB/s), 13.9MiB/s-13.9MiB/s (14.6MB/s-14.6MB/s), io=5120MiB (5369MB), run=368060-368060msec