我正在一个malloc实验室程序,我需要找到效用和吞吐量的性能指标。我能够获得输出效率,但第一次执行时有一个问题。内存分配第一次在终端上编译错误
我给出了特定的一组文件,其中包括跟踪和其他文件,当我试图运行该程序第一次它显示错误,但是当我运行相同的代码相同的命令第二次多次我不是得到错误和输出是好的?为什么它在第一次运行时显示错误?在malloc中分配内存或执行操作有什么问题吗?
的命令,第一时间误差如下,
enter code here
@ubuntu:$ make
当我运行此我第一次收到错误是如下
,
enter code here
gcc -Wall -O2 -m32 -c -o mdriver.o mdriver.c
mdriver.c: In function ‘remove_range’:
mdriver.c:438:9: warning: variable ‘size’ set but not used [-Wunused-but-set-variable]
int size;
^
mdriver.c: In function ‘read_trace’:
mdriver.c:498:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
fscanf(tracefile, "%d", &(trace->sugg_heapsize)); /* not used */
^
mdriver.c:499:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
fscanf(tracefile, "%d", &(trace->num_ids));
^
mdriver.c:500:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
fscanf(tracefile, "%d", &(trace->num_ops));
^
mdriver.c:501:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
fscanf(tracefile, "%d", &(trace->weight)); /* not used */
^
mdriver.c:524:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
fscanf(tracefile, "%u %u", &index, &size);
^
mdriver.c:531:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
fscanf(tracefile, "%u %u", &index, &size);
^
mdriver.c:538:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
fscanf(tracefile, "%ud", &index);
^
gcc -Wall -O2 -m32 -c -o mm.o mm.c
mm.c:780:13: warning: ‘mm_check’ defined but not used [-Wunused-function]
static int mm_check(void)
^
gcc -Wall -O2 -m32 -c -o memlib.o memlib.c
gcc -Wall -O2 -m32 -c -o fsecs.o fsecs.c
gcc -Wall -O2 -m32 -c -o fcyc.o fcyc.c
gcc -Wall -O2 -m32 -c -o clock.o clock.c
gcc -Wall -O2 -m32 -c -o ftimer.o ftimer.c
gcc -Wall -O2 -m32 -o mdriver mdriver.o mm.o memlib.o fsecs.o fcyc.o clock.o ftimer.o
我再次
运行相同的命令enter code here
@ubuntu:$ make
make: `mdriver' is up to date.
现在,然后它显示没有错误,之后,如果我用所需的逗号运行该程序nds它工作得很好,但它第一次显示错误?
您有两种选择:(a)修复产生警告的代码,(b)禁用警告。如果你选择(b)准备承担后果:) – 2014-10-29 02:36:17