== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:49:31 (1717019371)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.860119 s, 122 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: 2.32101
Iter 1/10: OSS cache speed: 2.09983
Iter 1/10: ladvise speed: 1.972
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.10602
Iter 2/10: OSS cache speed: 2.03422
Iter 2/10: ladvise speed: 2.01416
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.96396
Iter 3/10: OSS cache speed: 1.89418
Iter 3/10: ladvise speed: 1.83551
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 1.9166
Iter 4/10: OSS cache speed: 1.80156
Iter 4/10: ladvise speed: 1.90644
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.81621
Iter 5/10: OSS cache speed: 1.76215
Iter 5/10: ladvise speed: 1.9239
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.96683
Iter 6/10: OSS cache speed: 2.01882
Iter 6/10: ladvise speed: 1.87326
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.76481
Iter 7/10: OSS cache speed: 1.753
Iter 7/10: ladvise speed: 1.68816
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.75011
Iter 8/10: OSS cache speed: 1.77914
Iter 8/10: ladvise speed: 1.73474
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.65329
Iter 9/10: OSS cache speed: 1.73132
Iter 9/10: ladvise speed: 1.70367
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.86143
Iter 10/10: OSS cache speed: 1.81353
Iter 10/10: ladvise speed: 1.73893
Average uncached read: 1.91
Average speedup with OSS cached read:  1.86 = +-2.61%
Average speedup with ladvise willread:  1.83 = +-4.18%
Speedup with OSS cached read less than 20%,  got 1.86%. Skipping ladvise willread check.