== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 14:05:37 (1772478337)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.60594 s, 15.9 MB/s
llite.lustre-ffff9b0a1f593000.read_ahead_stats=clear
llite.lustre-ffff9b0a1f593000.read_ahead_stats=
snapshot_time             1772478352.500786789 secs.nsecs
start_time                1772478345.592490157 secs.nsecs
elapsed_time              6.908296632 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=290992: Mon Mar  2 14:12:53 2026
  read: IOPS=12, BW=12.2MiB/s (12.8MB/s)(5120MiB/418327msec)
    clat (msec): min=28, max=292, avg=81.52, stdev=34.06
     lat (msec): min=28, max=292, avg=81.52, stdev=34.06
    clat percentiles (msec):
     |  1.00th=[   51],  5.00th=[   55], 10.00th=[   58], 20.00th=[   62],
     | 30.00th=[   64], 40.00th=[   67], 50.00th=[   69], 60.00th=[   72],
     | 70.00th=[   77], 80.00th=[   85], 90.00th=[  146], 95.00th=[  159],
     | 99.00th=[  186], 99.50th=[  213], 99.90th=[  264], 99.95th=[  271],
     | 99.99th=[  292]
   bw (  KiB/s): min= 2048, max=18432, per=100.00%, avg=12569.74, stdev=4157.36, samples=834
   iops        : min=    2, max=   18, avg=12.26, stdev= 4.06, samples=834
  lat (msec)   : 50=0.94%, 100=82.05%, 250=16.84%, 500=0.18%
  cpu          : usr=0.59%, sys=87.29%, ctx=11569, 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=12.2MiB/s (12.8MB/s), 12.2MiB/s-12.2MiB/s (12.8MB/s-12.8MB/s), io=5120MiB (5369MB), run=418327-418327msec