== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:28:23 (1736983703)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.721064 s, 145 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: 2.34964
Iter 1/10: OSS cache speed: 2.01583
Iter 1/10: ladvise speed: 2.2163
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.78991
Iter 2/10: OSS cache speed: 3.07903
Iter 2/10: ladvise speed: 2.69812
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.4982
Iter 3/10: OSS cache speed: 2.07945
Iter 3/10: ladvise speed: 2.40531
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.38168
Iter 4/10: OSS cache speed: 2.41705
Iter 4/10: ladvise speed: 2.81515
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.4953
Iter 5/10: OSS cache speed: 2.73672
Iter 5/10: ladvise speed: 2.86167
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.70478
Iter 6/10: OSS cache speed: 3.24642
Iter 6/10: ladvise speed: 1.59529
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.65645
Iter 7/10: OSS cache speed: 2.32182
Iter 7/10: ladvise speed: 2.41641
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.84204
Iter 8/10: OSS cache speed: 2.24595
Iter 8/10: ladvise speed: 2.18676
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.01464
Iter 9/10: OSS cache speed: 1.25558
Iter 9/10: ladvise speed: 1.08481
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.18739
Iter 10/10: OSS cache speed: 1.14347
Iter 10/10: ladvise speed: 1.02458
Average uncached read: 2.19
Average speedup with OSS cached read:  2.25 = +2.73%
Average speedup with ladvise willread:  2.13 = +-2.73%
Speedup with OSS cached read less than 20%,  got 2.25%. Skipping ladvise willread check.