== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:46:10 (1781210770)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.2619 s, 7.9 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-ffff9b56861a2000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.253457
Iter 1/10: OSS cache speed: 0.350988
Iter 1/10: ladvise speed: 0.279306
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.321811
Iter 2/10: OSS cache speed: 0.292847
Iter 2/10: ladvise speed: 0.339793
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.315892
Iter 3/10: OSS cache speed: 0.307022
Iter 3/10: ladvise speed: 0.326938
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.321576
Iter 4/10: OSS cache speed: 0.298574
Iter 4/10: ladvise speed: 0.311954
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.3501
Iter 5/10: OSS cache speed: 0.310504
Iter 5/10: ladvise speed: 0.294829
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.304698
Iter 6/10: OSS cache speed: 0.296682
Iter 6/10: ladvise speed: 0.307483
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.33573
Iter 7/10: OSS cache speed: 0.30298
Iter 7/10: ladvise speed: 0.309413
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.295223
Iter 8/10: OSS cache speed: 0.258951
Iter 8/10: ladvise speed: 0.320883
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.285321
Iter 9/10: OSS cache speed: 0.273153
Iter 9/10: ladvise speed: 0.304454
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.318804
Iter 10/10: OSS cache speed: 0.275886
Iter 10/10: ladvise speed: 0.303797
Average uncached read: .31
Average speedup with OSS cached read:  .29 = +-6%
Average speedup with ladvise willread:  .30 = +-3%
Speedup with OSS cached read less than 20%,  got -6%. Skipping ladvise willread check.
fail_loc=0