== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 21:34:59 (1777426499)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.18038 s, 14.6 MB/s
llite.lustre-ffff937b06a13000.read_ahead_stats=clear
llite.lustre-ffff937b06a13000.read_ahead_stats=
snapshot_time             1777426515.041766183 secs.nsecs
start_time                1777426508.254492765 secs.nsecs
elapsed_time              6.787273418 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=298661: Tue Apr 28 21:42:27 2026
  read: IOPS=11, BW=11.9MiB/s (12.5MB/s)(5120MiB/429250msec)
    clat (msec): min=43, max=310, avg=83.65, stdev=38.92
     lat (msec): min=43, max=310, avg=83.65, stdev=38.92
    clat percentiles (msec):
     |  1.00th=[   51],  5.00th=[   55], 10.00th=[   58], 20.00th=[   62],
     | 30.00th=[   64], 40.00th=[   67], 50.00th=[   69], 60.00th=[   71],
     | 70.00th=[   75], 80.00th=[   84], 90.00th=[  155], 95.00th=[  165],
     | 99.00th=[  228], 99.50th=[  249], 99.90th=[  279], 99.95th=[  288],
     | 99.99th=[  313]
   bw (  KiB/s): min= 2048, max=20480, per=100.00%, avg=12247.02, stdev=4459.62, samples=856
   iops        : min=    2, max=   20, avg=11.95, stdev= 4.35, samples=856
  lat (msec)   : 50=0.84%, 100=81.91%, 250=16.80%, 500=0.45%
  cpu          : usr=0.58%, sys=87.53%, ctx=11637, majf=5122, minf=1305867
  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=11.9MiB/s (12.5MB/s), 11.9MiB/s-11.9MiB/s (12.5MB/s-12.5MB/s), io=5120MiB (5369MB), run=429250-429250msec