== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:29:12 (1736983752)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.707546 s, 148 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=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 5.00278
Iter 1/10: OSS cache speed: 4.82085
Iter 1/10: ladvise speed: 5.30665
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.70845
Iter 2/10: OSS cache speed: 6.12825
Iter 2/10: ladvise speed: 6.03351
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.41258
Iter 3/10: OSS cache speed: 6.26048
Iter 3/10: ladvise speed: 5.64308
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.06469
Iter 4/10: OSS cache speed: 5.8682
Iter 4/10: ladvise speed: 7.00358
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.54385
Iter 5/10: OSS cache speed: 6.17038
Iter 5/10: ladvise speed: 6.18249
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.90454
Iter 6/10: OSS cache speed: 6.84712
Iter 6/10: ladvise speed: 6.85279
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 6.19364
Iter 7/10: OSS cache speed: 4.99875
Iter 7/10: ladvise speed: 6.33861
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.65837
Iter 8/10: OSS cache speed: 6.953
Iter 8/10: ladvise speed: 6.72325
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 6.19989
Iter 9/10: OSS cache speed: 6.86616
Iter 9/10: ladvise speed: 7.04881
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.77374
Iter 10/10: OSS cache speed: 6.37662
Iter 10/10: ladvise speed: 7.3873
Average uncached read: 5.44
Average speedup with OSS cached read:  6.12 = +12.50%
Average speedup with ladvise willread:  6.45 = +18.56%
Speedup with OSS cached read less than 20%,  got 6.12%. Skipping ladvise willread check.