== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 15:28:17 (1767040097)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.8649 s, 15.3 MB/s
llite.lustre-ffff9c365bd2b000.read_ahead_stats=clear
llite.lustre-ffff9c365bd2b000.read_ahead_stats=
snapshot_time             1767040112.236434069 secs.nsecs
start_time                1767040105.847915582 secs.nsecs
elapsed_time              6.388518487 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=295704: Mon Dec 29 15:34:42 2025
  read: IOPS=13, BW=13.9MiB/s (14.6MB/s)(5120MiB/367372msec)
    clat (msec): min=38, max=271, avg=71.57, stdev=31.27
     lat (msec): min=38, max=271, avg=71.57, stdev=31.27
    clat percentiles (msec):
     |  1.00th=[   41],  5.00th=[   47], 10.00th=[   48], 20.00th=[   51],
     | 30.00th=[   53], 40.00th=[   55], 50.00th=[   59], 60.00th=[   66],
     | 70.00th=[   71], 80.00th=[  106], 90.00th=[  117], 95.00th=[  125],
     | 99.00th=[  205], 99.50th=[  228], 99.90th=[  243], 99.95th=[  251],
     | 99.99th=[  271]
   bw (  KiB/s): min= 4096, max=22528, per=100.00%, avg=14310.77, stdev=5036.45, samples=732
   iops        : min=    4, max=   22, avg=13.97, stdev= 4.92, samples=732
  lat (msec)   : 50=19.98%, 100=57.93%, 250=22.03%, 500=0.06%
  cpu          : usr=0.64%, sys=84.83%, ctx=11728, majf=5124, minf=1305865
  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=13.9MiB/s (14.6MB/s), 13.9MiB/s-13.9MiB/s (14.6MB/s-14.6MB/s), io=5120MiB (5369MB), run=367372-367372msec