== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 22:55:16 (1767326116)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.60611 s, 15.9 MB/s
llite.lustre-ffff9eb34ab39800.read_ahead_stats=clear
llite.lustre-ffff9eb34ab39800.read_ahead_stats=
snapshot_time             1767326130.368503665 secs.nsecs
start_time                1767326125.060936642 secs.nsecs
elapsed_time              5.307567023 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=295604: Thu Jan  1 23:01:23 2026
  read: IOPS=14, BW=14.6MiB/s (15.3MB/s)(5120MiB/350099msec)
    clat (msec): min=16, max=2600, avg=68.15, stdev=78.98
     lat (msec): min=16, max=2600, avg=68.15, stdev=78.98
    clat percentiles (msec):
     |  1.00th=[   28],  5.00th=[   33], 10.00th=[   40], 20.00th=[   45],
     | 30.00th=[   48], 40.00th=[   52], 50.00th=[   55], 60.00th=[   65],
     | 70.00th=[   74], 80.00th=[   82], 90.00th=[  101], 95.00th=[  114],
     | 99.00th=[  211], 99.50th=[  296], 99.90th=[ 1536], 99.95th=[ 2366],
     | 99.99th=[ 2601]
   bw (  KiB/s): min= 2048, max=30720, per=100.00%, avg=15468.14, stdev=5440.78, samples=659
   iops        : min=    2, max=   30, avg=14.74, stdev= 5.35, samples=659
  lat (msec)   : 20=0.25%, 50=34.98%, 100=54.86%, 250=9.10%, 500=0.62%
  lat (msec)   : 750=0.06%, 2000=0.06%, >=2000=0.06%
  cpu          : usr=0.84%, sys=85.92%, ctx=33148, majf=95, minf=1310897
  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=14.6MiB/s (15.3MB/s), 14.6MiB/s-14.6MiB/s (15.3MB/s-15.3MB/s), io=5120MiB (5369MB), run=350099-350099msec