== sanity test 255a: check 'lfs ladvise -a willread' ===== 05:01:50 (1713344510)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.911974 s, 115 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: 1.82155
Iter 1/10: OSS cache speed: 2.35344
Iter 1/10: ladvise speed: 2.31379
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.92595
Iter 2/10: OSS cache speed: 2.34619
Iter 2/10: ladvise speed: 3.29314
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.86434
Iter 3/10: OSS cache speed: 3.34164
Iter 3/10: ladvise speed: 3.25619
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.36606
Iter 4/10: OSS cache speed: 2.87735
Iter 4/10: ladvise speed: 3.33618
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.82298
Iter 5/10: OSS cache speed: 3.45545
Iter 5/10: ladvise speed: 4.00045
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.16377
Iter 6/10: OSS cache speed: 4.52012
Iter 6/10: ladvise speed: 5.39048
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.65875
Iter 7/10: OSS cache speed: 5.07122
Iter 7/10: ladvise speed: 5.2957
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.75909
Iter 8/10: OSS cache speed: 4.5784
Iter 8/10: ladvise speed: 4.75292
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.60633
Iter 9/10: OSS cache speed: 5.01797
Iter 9/10: ladvise speed: 4.97198
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.66312
Iter 10/10: OSS cache speed: 4.7276
Iter 10/10: ladvise speed: 4.79208
Average uncached read: 3.66
Average speedup with OSS cached read:  3.82 = +4.37%
Average speedup with ladvise willread:  4.14 = +13.11%
Speedup with OSS cached read less than 20%,  got 3.82%. Skipping ladvise willread check.