== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:53:05 (1784123585)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.76812 s, 15.5 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-ffff9318839ae800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.86956
Iter 1/10: OSS cache speed: 2.21155
Iter 1/10: ladvise speed: 2.35167
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.75409
Iter 2/10: OSS cache speed: 0.660511
Iter 2/10: ladvise speed: 1.13014
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.818234
Iter 3/10: OSS cache speed: 0.882639
Iter 3/10: ladvise speed: 0.623347
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.557339
Iter 4/10: OSS cache speed: 0.898204
Iter 4/10: ladvise speed: 1.09715
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.90434
Iter 5/10: OSS cache speed: 0.528635
Iter 5/10: ladvise speed: 0.6449
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.582168
Iter 6/10: OSS cache speed: 0.785979
Iter 6/10: ladvise speed: 0.378244
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.584345
Iter 7/10: OSS cache speed: 0.651154
Iter 7/10: ladvise speed: 0.580102
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.495041
Iter 8/10: OSS cache speed: 0.618228
Iter 8/10: ladvise speed: 0.787483
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.657726
Iter 9/10: OSS cache speed: 1.0888
Iter 9/10: ladvise speed: 1.31595
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.26456
Iter 10/10: OSS cache speed: 1.48732
Iter 10/10: ladvise speed: 1.58991
Average uncached read: .94
Average speedup with OSS cached read:  .98 = +4%
Average speedup with ladvise willread:  1.04 = +10%
Speedup with OSS cached read less than 20%,  got 4%. Skipping ladvise willread check.
fail_loc=0