== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 03:06:28 (1769760388)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.72989 s, 13.6 MB/s
llite.lustre-ffff9bfcb2239800.read_ahead_stats=clear
llite.lustre-ffff9bfcb2239800.read_ahead_stats=
snapshot_time             1769760409.393031526 secs.nsecs
start_time                1769760399.432001873 secs.nsecs
elapsed_time              9.961029653 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          32 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=226593: Fri Jan 30 03:13:09 2026
  read: IOPS=13, BW=13.6MiB/s (14.2MB/s)(5120MiB/376987msec)
    clat (msec): min=14, max=198, avg=73.40, stdev=25.65
     lat (msec): min=14, max=198, avg=73.40, stdev=25.65
    clat percentiles (msec):
     |  1.00th=[   44],  5.00th=[   49], 10.00th=[   52], 20.00th=[   55],
     | 30.00th=[   57], 40.00th=[   60], 50.00th=[   63], 60.00th=[   68],
     | 70.00th=[   77], 80.00th=[  103], 90.00th=[  115], 95.00th=[  122],
     | 99.00th=[  148], 99.50th=[  165], 99.90th=[  182], 99.95th=[  188],
     | 99.99th=[  199]
   bw (  KiB/s): min= 5988, max=22528, per=100.00%, avg=13960.11, stdev=4237.92, samples=749
   iops        : min=    5, max=   22, avg=13.38, stdev= 4.18, samples=749
  lat (msec)   : 20=0.04%, 50=7.54%, 100=71.80%, 250=20.62%
  cpu          : usr=0.66%, sys=73.34%, ctx=15461, majf=5608, minf=1305380
  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=13.6MiB/s (14.2MB/s), 13.6MiB/s-13.6MiB/s (14.2MB/s-14.2MB/s), io=5120MiB (5369MB), run=376987-376987msec