== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 08:38:01 (1768311481)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 9.19023 s, 11.4 MB/s
llite.lustre-ffffa0357b04e800.read_ahead_stats=clear
llite.lustre-ffffa0357b04e800.read_ahead_stats=
snapshot_time             1768311502.964184748 secs.nsecs
start_time                1768311494.835050618 secs.nsecs
elapsed_time              8.129134130 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          6 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=291582: Tue Jan 13 08:44:43 2026
  read: IOPS=13, BW=13.7MiB/s (14.4MB/s)(5120MiB/373994msec)
    clat (msec): min=12, max=2441, avg=72.58, stdev=107.52
     lat (msec): min=12, max=2441, avg=72.59, stdev=107.52
    clat percentiles (msec):
     |  1.00th=[   20],  5.00th=[   28], 10.00th=[   32], 20.00th=[   39],
     | 30.00th=[   44], 40.00th=[   50], 50.00th=[   56], 60.00th=[   63],
     | 70.00th=[   72], 80.00th=[   91], 90.00th=[  124], 95.00th=[  148],
     | 99.00th=[  220], 99.50th=[  296], 99.90th=[ 2056], 99.95th=[ 2232],
     | 99.99th=[ 2433]
   bw (  KiB/s): min= 1635, max=38912, per=100.00%, avg=14853.49, stdev=6624.60, samples=690
   iops        : min=    1, max=   38, avg=13.93, stdev= 6.54, samples=690
  lat (msec)   : 20=1.19%, 50=39.51%, 100=42.56%, 250=16.05%, 500=0.31%
  lat (msec)   : 750=0.06%, 1000=0.04%, 2000=0.12%, >=2000=0.16%
  cpu          : usr=0.76%, sys=48.66%, ctx=28401, majf=1066, minf=1309924
  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=13.7MiB/s (14.4MB/s), 13.7MiB/s-13.7MiB/s (14.4MB/s-14.4MB/s), io=5120MiB (5369MB), run=373994-373994msec