== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 14:05:44 (1772478344)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.20182 s, 16.9 MB/s
llite.lustre-ffff8a8004f1a000.read_ahead_stats=clear
llite.lustre-ffff8a8004f1a000.read_ahead_stats=
snapshot_time             1772478358.769115708 secs.nsecs
start_time                1772478352.069356138 secs.nsecs
elapsed_time              6.699759570 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=291635: Mon Mar  2 14:12:51 2026
  read: IOPS=12, BW=12.5MiB/s (13.1MB/s)(5120MiB/410105msec)
    clat (msec): min=42, max=259, avg=79.93, stdev=32.97
     lat (msec): min=42, max=259, avg=79.93, stdev=32.97
    clat percentiles (msec):
     |  1.00th=[   51],  5.00th=[   55], 10.00th=[   58], 20.00th=[   61],
     | 30.00th=[   63], 40.00th=[   65], 50.00th=[   67], 60.00th=[   70],
     | 70.00th=[   74], 80.00th=[   83], 90.00th=[  144], 95.00th=[  155],
     | 99.00th=[  176], 99.50th=[  194], 99.90th=[  230], 99.95th=[  243],
     | 99.99th=[  259]
   bw (  KiB/s): min= 4096, max=20480, per=100.00%, avg=12818.83, stdev=4251.74, samples=817
   iops        : min=    4, max=   20, avg=12.50, stdev= 4.16, samples=817
  lat (msec)   : 50=0.80%, 100=82.15%, 250=17.03%, 500=0.02%
  cpu          : usr=0.62%, sys=87.20%, ctx=11683, majf=5121, 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=12.5MiB/s (13.1MB/s), 12.5MiB/s-12.5MiB/s (13.1MB/s-13.1MB/s), io=5120MiB (5369MB), run=410105-410105msec