== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:06:21 (1736262381)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.579335 s, 181 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: 5.52909
Iter 1/10: OSS cache speed: 6.37989
Iter 1/10: ladvise speed: 6.70887
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 6.63393
Iter 2/10: OSS cache speed: 7.4226
Iter 2/10: ladvise speed: 7.24486
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.61753
Iter 3/10: OSS cache speed: 7.20831
Iter 3/10: ladvise speed: 6.5706
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.60457
Iter 4/10: OSS cache speed: 6.67572
Iter 4/10: ladvise speed: 6.80449
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.71203
Iter 5/10: OSS cache speed: 6.69205
Iter 5/10: ladvise speed: 6.38775
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.89974
Iter 6/10: OSS cache speed: 6.6958
Iter 6/10: ladvise speed: 6.52993
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.96181
Iter 7/10: OSS cache speed: 7.30846
Iter 7/10: ladvise speed: 7.18796
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.73644
Iter 8/10: OSS cache speed: 6.24642
Iter 8/10: ladvise speed: 6.45984
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.9099
Iter 9/10: OSS cache speed: 5.18064
Iter 9/10: ladvise speed: 4.53293
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.64044
Iter 10/10: OSS cache speed: 3.53926
Iter 10/10: ladvise speed: 3.18966
Average uncached read: 5.32
Average speedup with OSS cached read:  6.33 = +18.98%
Average speedup with ladvise willread:  6.16 = +15.78%
Speedup with OSS cached read less than 20%,  got 6.33%. Skipping ladvise willread check.