== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 00:21:37 (1770441697)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.81844 s, 18.0 MB/s
llite.lustre-ffff9531c0ad1800.read_ahead_stats=clear
llite.lustre-ffff9531c0ad1800.read_ahead_stats=
snapshot_time             1770441710.377450115 secs.nsecs
start_time                1770441705.200619449 secs.nsecs
elapsed_time              5.176830666 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=305434: Sat Feb  7 00:27:24 2026
  read: IOPS=15, BW=15.5MiB/s (16.2MB/s)(5120MiB/330760msec)
    clat (msec): min=10, max=197, avg=64.42, stdev=26.35
     lat (msec): min=10, max=197, avg=64.42, stdev=26.35
    clat percentiles (msec):
     |  1.00th=[   39],  5.00th=[   44], 10.00th=[   45], 20.00th=[   47],
     | 30.00th=[   49], 40.00th=[   51], 50.00th=[   52], 60.00th=[   55],
     | 70.00th=[   59], 80.00th=[   99], 90.00th=[  108], 95.00th=[  113],
     | 99.00th=[  140], 99.50th=[  165], 99.90th=[  192], 99.95th=[  197],
     | 99.99th=[  199]
   bw (  KiB/s): min= 4096, max=24576, per=100.00%, avg=15904.05, stdev=5527.66, samples=659
   iops        : min=    4, max=   24, avg=15.50, stdev= 5.41, samples=659
  lat (msec)   : 20=0.02%, 50=39.92%, 100=41.95%, 250=18.11%
  cpu          : usr=0.70%, sys=85.20%, ctx=11351, majf=5129, minf=1305861
  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=15.5MiB/s (16.2MB/s), 15.5MiB/s-15.5MiB/s (16.2MB/s-16.2MB/s), io=5120MiB (5369MB), run=330760-330760msec