== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 07:11:25 (1769083885)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 9.11467 s, 11.5 MB/s
llite.lustre-ffff9f27474fa800.read_ahead_stats=clear
llite.lustre-ffff9f27474fa800.read_ahead_stats=
snapshot_time             1769083905.442757214 secs.nsecs
start_time                1769083898.319912386 secs.nsecs
elapsed_time              7.122844828 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          4 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=291541: Thu Jan 22 07:17:05 2026
  read: IOPS=16, BW=16.3MiB/s (17.1MB/s)(5120MiB/313466msec)
    clat (msec): min=14, max=2757, avg=60.83, stdev=122.50
     lat (msec): min=14, max=2757, avg=60.84, stdev=122.50
    clat percentiles (msec):
     |  1.00th=[   20],  5.00th=[   24], 10.00th=[   28], 20.00th=[   35],
     | 30.00th=[   40], 40.00th=[   45], 50.00th=[   50], 60.00th=[   55],
     | 70.00th=[   61], 80.00th=[   68], 90.00th=[   83], 95.00th=[  101],
     | 99.00th=[  190], 99.50th=[  271], 99.90th=[ 2400], 99.95th=[ 2668],
     | 99.99th=[ 2769]
   bw (  KiB/s): min= 1976, max=38603, per=100.00%, avg=18384.86, stdev=5994.19, samples=556
   iops        : min=    1, max=   37, avg=17.39, stdev= 5.86, samples=556
  lat (msec)   : 20=1.35%, 50=49.77%, 100=43.83%, 250=4.51%, 500=0.16%
  lat (msec)   : 750=0.04%, 1000=0.06%, 2000=0.12%, >=2000=0.18%
  cpu          : usr=0.88%, sys=53.29%, ctx=25808, majf=53, minf=1310939
  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=16.3MiB/s (17.1MB/s), 16.3MiB/s-16.3MiB/s (17.1MB/s-17.1MB/s), io=5120MiB (5369MB), run=313466-313466msec