== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 00:23:21 (1763357001)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.95587 s, 15.1 MB/s
llite.lustre-ffffa02a03785800.read_ahead_stats=clear
llite.lustre-ffffa02a03785800.read_ahead_stats=
snapshot_time             1763357016.083505681 secs.nsecs
start_time                1763357009.961475910 secs.nsecs
elapsed_time              6.122029771 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=294126: Mon Nov 17 00:30:15 2025
  read: IOPS=12, BW=12.9MiB/s (13.5MB/s)(5120MiB/397011msec)
    clat (msec): min=15, max=264, avg=77.37, stdev=42.11
     lat (msec): min=15, max=264, avg=77.38, stdev=42.11
    clat percentiles (msec):
     |  1.00th=[   43],  5.00th=[   50], 10.00th=[   51], 20.00th=[   53],
     | 30.00th=[   55], 40.00th=[   57], 50.00th=[   59], 60.00th=[   63],
     | 70.00th=[   71], 80.00th=[  110], 90.00th=[  128], 95.00th=[  180],
     | 99.00th=[  234], 99.50th=[  241], 99.90th=[  245], 99.95th=[  247],
     | 99.99th=[  264]
   bw (  KiB/s): min= 4087, max=22528, per=100.00%, avg=13242.67, stdev=5555.10, samples=791
   iops        : min=    3, max=   22, avg=12.91, stdev= 5.43, samples=791
  lat (msec)   : 20=0.02%, 50=8.20%, 100=69.79%, 250=21.97%, 500=0.02%
  cpu          : usr=0.71%, sys=84.73%, ctx=11756, majf=5126, minf=1305862
  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=12.9MiB/s (13.5MB/s), 12.9MiB/s-12.9MiB/s (13.5MB/s-13.5MB/s), io=5120MiB (5369MB), run=397011-397011msec