== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 21:19:57 (1777425597)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.04783 s, 17.3 MB/s
llite.lustre-ffff96f2b3ac8800.read_ahead_stats=clear
llite.lustre-ffff96f2b3ac8800.read_ahead_stats=
snapshot_time             1777425613.332933336 secs.nsecs
start_time                1777425605.191276975 secs.nsecs
elapsed_time              8.141656361 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          5 samples [pages]
failed_to_reach_end       1 samples [pages]
failed_to_fast_read       230 samples [pages]
mmap_range_read           225 samples [pages]
readahead_pages           225 samples [pages] 8 128 25370
/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=234755: Tue Apr 28 21:27:13 2026
  read: IOPS=12, BW=12.3MiB/s (12.9MB/s)(5120MiB/417291msec)
    clat (msec): min=43, max=273, avg=81.31, stdev=32.26
     lat (msec): min=43, max=273, avg=81.31, stdev=32.26
    clat percentiles (msec):
     |  1.00th=[   52],  5.00th=[   57], 10.00th=[   59], 20.00th=[   62],
     | 30.00th=[   65], 40.00th=[   67], 50.00th=[   69], 60.00th=[   71],
     | 70.00th=[   74], 80.00th=[   83], 90.00th=[  142], 95.00th=[  153],
     | 99.00th=[  171], 99.50th=[  190], 99.90th=[  232], 99.95th=[  249],
     | 99.99th=[  275]
   bw (  KiB/s): min= 4096, max=18432, per=100.00%, avg=12598.29, stdev=4129.73, samples=832
   iops        : min=    4, max=   18, avg=12.25, stdev= 4.05, samples=832
  lat (msec)   : 50=0.68%, 100=80.64%, 250=18.63%, 500=0.04%
  cpu          : usr=0.60%, sys=86.61%, ctx=13505, majf=5131, minf=1305857
  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=12.3MiB/s (12.9MB/s), 12.3MiB/s-12.3MiB/s (12.9MB/s-12.9MB/s), io=5120MiB (5369MB), run=417291-417291msec