== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:12:01 (1717153921)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.494644 s, 212 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: 3.48642
Iter 1/10: OSS cache speed: 4.09906
Iter 1/10: ladvise speed: 5.02009
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.61734
Iter 2/10: OSS cache speed: 3.26771
Iter 2/10: ladvise speed: 3.08976
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.01178
Iter 3/10: OSS cache speed: 3.52051
Iter 3/10: ladvise speed: 4.40367
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.81527
Iter 4/10: OSS cache speed: 4.26704
Iter 4/10: ladvise speed: 4.32967
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.3234
Iter 5/10: OSS cache speed: 3.12589
Iter 5/10: ladvise speed: 3.71009
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.63596
Iter 6/10: OSS cache speed: 4.30119
Iter 6/10: ladvise speed: 3.35647
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.43667
Iter 7/10: OSS cache speed: 3.9643
Iter 7/10: ladvise speed: 4.61713
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.90594
Iter 8/10: OSS cache speed: 3.09599
Iter 8/10: ladvise speed: 3.01173
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.98748
Iter 9/10: OSS cache speed: 2.95125
Iter 9/10: ladvise speed: 2.92831
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.72308
Iter 10/10: OSS cache speed: 3.0843
Iter 10/10: ladvise speed: 3.02998
Average uncached read: 3.69
Average speedup with OSS cached read:  3.56 = +-3.52%
Average speedup with ladvise willread:  3.74 = +1.35%
Speedup with OSS cached read less than 20%,  got 3.56%. Skipping ladvise willread check.