== sanity test 255a: check 'lfs ladvise -a willread' ===== 21:20:23 (1746148823)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 4.47347 s, 23.4 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff88012d0fb000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.726139
Iter 1/10: OSS cache speed: 0.864789
Iter 1/10: ladvise speed: 0.9076
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.772282
Iter 2/10: OSS cache speed: 0.836739
Iter 2/10: ladvise speed: 0.88969
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.723779
Iter 3/10: OSS cache speed: 0.74501
Iter 3/10: ladvise speed: 0.827593
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.624715
Iter 4/10: OSS cache speed: 0.691129
Iter 4/10: ladvise speed: 0.965677
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.788931
Iter 5/10: OSS cache speed: 0.986156
Iter 5/10: ladvise speed: 1.07813
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.014
Iter 6/10: OSS cache speed: 0.763952
Iter 6/10: ladvise speed: 0.832237
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.777191
Iter 7/10: OSS cache speed: 1.03082
Iter 7/10: ladvise speed: 0.865814
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.745105
Iter 8/10: OSS cache speed: 0.98246
Iter 8/10: ladvise speed: 0.996741
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.900713
Iter 9/10: OSS cache speed: 0.972592
Iter 9/10: ladvise speed: 0.987003
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.660971
Iter 10/10: OSS cache speed: 0.837317
Iter 10/10: ladvise speed: 1.07585
Average uncached read: .77
Average speedup with OSS cached read:  .87 = +12%
Average speedup with ladvise willread:  .94 = +22%
Speedup with OSS cached read less than 20%,  got 12%. Skipping ladvise willread check.
fail_loc=0