== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:58:11 (1787615891)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.9455 s, 9.6 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-ffff9e960962f000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.368507
Iter 1/10: OSS cache speed: 0.42483
Iter 1/10: ladvise speed: 0.500662
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.475578
Iter 2/10: OSS cache speed: 0.543022
Iter 2/10: ladvise speed: 0.483699
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.461911
Iter 3/10: OSS cache speed: 0.485958
Iter 3/10: ladvise speed: 0.452329
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.495129
Iter 4/10: OSS cache speed: 0.514308
Iter 4/10: ladvise speed: 0.492726
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.4435
Iter 5/10: OSS cache speed: 0.476273
Iter 5/10: ladvise speed: 0.463689
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.309277
Iter 6/10: OSS cache speed: 0.437727
Iter 6/10: ladvise speed: 0.452675
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.37849
Iter 7/10: OSS cache speed: 0.45094
Iter 7/10: ladvise speed: 0.336621
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.424722
Iter 8/10: OSS cache speed: 0.475015
Iter 8/10: ladvise speed: 0.452873
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.421553
Iter 9/10: OSS cache speed: 0.532807
Iter 9/10: ladvise speed: 0.521717
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.416391
Iter 10/10: OSS cache speed: 0.485028
Iter 10/10: ladvise speed: 0.515122
Average uncached read: .41
Average speedup with OSS cached read:  .48 = +17%
Average speedup with ladvise willread:  .46 = +12%
Speedup with OSS cached read less than 20%,  got 17%. Skipping ladvise willread check.
fail_loc=0