== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:38:10 (1721223490)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.750996 s, 140 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: 2.5432
Iter 1/10: OSS cache speed: 3.0071
Iter 1/10: ladvise speed: 3.01868
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.46862
Iter 2/10: OSS cache speed: 3.04158
Iter 2/10: ladvise speed: 3.16872
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.71314
Iter 3/10: OSS cache speed: 3.04229
Iter 3/10: ladvise speed: 3.0198
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.55906
Iter 4/10: OSS cache speed: 3.02289
Iter 4/10: ladvise speed: 3.03573
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.54676
Iter 5/10: OSS cache speed: 3.02913
Iter 5/10: ladvise speed: 3.16396
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.6481
Iter 6/10: OSS cache speed: 3.10282
Iter 6/10: ladvise speed: 3.13437
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.51067
Iter 7/10: OSS cache speed: 2.99116
Iter 7/10: ladvise speed: 3.12498
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.5361
Iter 8/10: OSS cache speed: 2.99111
Iter 8/10: ladvise speed: 3.19698
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.50462
Iter 9/10: OSS cache speed: 3.134
Iter 9/10: ladvise speed: 3.11565
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.58135
Iter 10/10: OSS cache speed: 3.00373
Iter 10/10: ladvise speed: 2.99967
Average uncached read: 2.56
Average speedup with OSS cached read:  3.03 = +18.35%
Average speedup with ladvise willread:  3.09 = +20.70%
Speedup with OSS cached read less than 20%,  got 3.03%. Skipping ladvise willread check.