== sanity test 255a: check 'lfs ladvise -a willread' ===== 11:37:40 (1761320260)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 1.58576 s, 66.1 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: 0.989743
Iter 1/10: OSS cache speed: 1.13096
Iter 1/10: ladvise speed: 1.11763
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.861344
Iter 2/10: OSS cache speed: 1.16313
Iter 2/10: ladvise speed: 1.33082
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.00804
Iter 3/10: OSS cache speed: 1.53971
Iter 3/10: ladvise speed: 1.76016
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 1.27378
Iter 4/10: OSS cache speed: 1.74827
Iter 4/10: ladvise speed: 1.8597
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.40743
Iter 5/10: OSS cache speed: 2.08485
Iter 5/10: ladvise speed: 2.03962
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.75393
Iter 6/10: OSS cache speed: 2.2933
Iter 6/10: ladvise speed: 2.46017
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.2913
Iter 7/10: OSS cache speed: 2.51991
Iter 7/10: ladvise speed: 3.11261
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.28326
Iter 8/10: OSS cache speed: 2.64367
Iter 8/10: ladvise speed: 2.40315
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.25868
Iter 9/10: OSS cache speed: 2.25175
Iter 9/10: ladvise speed: 3.18361
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.03925
Iter 10/10: OSS cache speed: 4.51645
Iter 10/10: ladvise speed: 1.58412
Average uncached read: 1.71
Average speedup with OSS cached read:  2.18 = +27.48%
Average speedup with ladvise willread:  2.08 = +21.63%
Speedup with OSS cached read less than 20%,  got 2.18%. Skipping ladvise willread check.