== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 14:54:46 (1763495686)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.96584 s, 15.1 MB/s
llite.lustre-ffff973711081800.read_ahead_stats=clear
llite.lustre-ffff973711081800.read_ahead_stats=
snapshot_time             1763495700.637618710 secs.nsecs
start_time                1763495695.382999639 secs.nsecs
elapsed_time              5.254619071 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=293270: Tue Nov 18 15:02:03 2025
  read: IOPS=12, BW=12.2MiB/s (12.8MB/s)(5120MiB/420012msec)
    clat (msec): min=15, max=3223, avg=81.79, stdev=140.18
     lat (msec): min=15, max=3223, avg=81.79, stdev=140.18
    clat percentiles (msec):
     |  1.00th=[   21],  5.00th=[   33], 10.00th=[   42], 20.00th=[   54],
     | 30.00th=[   58], 40.00th=[   61], 50.00th=[   64], 60.00th=[   68],
     | 70.00th=[   75], 80.00th=[   95], 90.00th=[  117], 95.00th=[  140],
     | 99.00th=[  236], 99.50th=[  405], 99.90th=[ 2400], 99.95th=[ 2534],
     | 99.99th=[ 3239]
   bw (  KiB/s): min= 1622, max=34539, per=100.00%, avg=13652.65, stdev=4697.74, samples=752
   iops        : min=    1, max=   33, avg=12.90, stdev= 4.69, samples=752
  lat (msec)   : 20=0.90%, 50=15.08%, 100=66.29%, 250=16.76%, 500=0.53%
  lat (msec)   : 750=0.04%, 2000=0.18%, >=2000=0.23%
  cpu          : usr=0.65%, sys=49.17%, ctx=19715, majf=2591, minf=1308398
  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=420012-420012msec