== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:16:03 (1772306163)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.684864 s, 153 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: 4.00349
Iter 1/10: OSS cache speed: 4.17259
Iter 1/10: ladvise speed: 4.15249
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.2677
Iter 2/10: OSS cache speed: 4.44421
Iter 2/10: ladvise speed: 4.50405
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.88286
Iter 3/10: OSS cache speed: 3.38679
Iter 3/10: ladvise speed: 3.80671
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.84853
Iter 4/10: OSS cache speed: 4.13739
Iter 4/10: ladvise speed: 4.27641
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.60853
Iter 5/10: OSS cache speed: 4.60041
Iter 5/10: ladvise speed: 4.42693
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.50019
Iter 6/10: OSS cache speed: 4.42211
Iter 6/10: ladvise speed: 4.53657
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.44616
Iter 7/10: OSS cache speed: 4.59435
Iter 7/10: ladvise speed: 4.53441
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.993
Iter 8/10: OSS cache speed: 3.9938
Iter 8/10: ladvise speed: 4.03024
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.38394
Iter 9/10: OSS cache speed: 3.65076
Iter 9/10: ladvise speed: 4.23325
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.26402
Iter 10/10: OSS cache speed: 4.18282
Iter 10/10: ladvise speed: 4.38483
Average uncached read: 4.21
Average speedup with OSS cached read:  4.15 = +-1.42%
Average speedup with ladvise willread:  4.28 = +1.66%
Speedup with OSS cached read less than 20%,  got 4.15%. Skipping ladvise willread check.