问题:

I am using [NSFileManager attributesOfItemAtPath:error:] function for fetching attributes of file. But sometimes my application cpu is going upto 100%. I am using this function for 100k(approx.) files.
Sample of my application:

                                2128 -[NSFileManager attributesOfItemAtPath:error:]
                                  2128 +[NSFileAttributes _attributesAtPath:partialReturn:filterResourceFork:error:]
                                    2123 _attributesAtPath
                                      2072 listxattr
                                      29 realloc
                                        18 realloc
                                        11 szone_size
                                      22 _attributesAtPath
                                    5 _sysenter_trap

Can anyone please help me out?

回答1:

I am using stat.

#import <sys/stat.h>

struct stat stat1;
if( stat([inFilePath fileSystemRepresentation], &stat1) )
      // something is wrong 
long long size = stat1.st_size;
printf("Size: %lld\n", stat1.st_size);

回答2:

SYSENTER is a companion instruction to SYSEXIT. The trap is a subset of a thread’s complete context. So, the trap frame keeps information about the current thread context so it could restore it with SYSEXIT instruction.

Link about Sysenter_traps.

It seems that you are overloading your main thread. Thats why Cpu is on 100%