Java 内存模型 Java 程序内存运行分析 Java 内存管理建议 JVM 内存溢出和参数调优  当遇到 OutOfMemoryError 时该如何做？ ▶ 常见的 OOM（Out Of Memory）内存溢出异常，就是堆内 存空间不足以存放新对象实例时导致。 ▶ 永久区内存溢出相对少见，一般是由于需要加载海量的 Class 数据，超过了非堆内存的容量导致。 ▶ 栈内存也会溢出，但是更加少见。 Java 内存模型 Java 程序内存运行分析 Java 内存管理建议 JVM 内存溢出和参数调优  当遇到 OutOfMemoryError 时该如何做？ ▶ 常见的 OOM（Out Of Memory）内存溢出异常，就是堆内 存空间不足以存放新对象实例时导致。 ▶ 永久区内存溢出相对少见，一般是由于需要加载海量的 Class 数据，超过了非堆内存的容量导致。 ▶ 栈内存也会溢出，但是更加少见。 Java 内存模型 Java 程序内存运行分析 Java 内存管理建议 JVM 内存溢出和参数调优  当遇到 OutOfMemoryError 时该如何做？ ▶ 常见的 OOM（Out Of Memory）内存溢出异常，就是堆内 存空间不足以存放新对象实例时导致。 ▶ 永久区内存溢出相对少见，一般是由于需要加载海量的 Class 数据，超过了非堆内存的容量导致。 ▶ 栈内存也会溢出，但是更加少见。

mod_auth_digest Includes additional support for session caching across processes using shared memory. mod_charset_lite New module in Apache 2.0. This experimental module allows for character set translation exception to this rule. Putting configuration restrictions in a section is perfectly safe because this section will apply to all requests regardless of the specific URL. Virtual Hosts The the complexity of actively ensuring the cachability of URLs, mod_file_cache offers file-handle and memory-mapping tricks to keep a cache of files as they were when Apache was last started. As such, mod_file_cache

mod_auth_digest Includes additional support for session caching across processes using shared memory. mod_charset_lite New module in Apache 2.0. This experimental module allows for character set translation exception to this rule. Putting configuration restrictions in a section is perfectly safe because this section will apply to all requests regardless of the specific URL. Virtual Hosts The the complexity of actively ensuring the cachability of URLs, mod_file_cache offers file-handle and memory-mapping tricks to keep a cache of files as they were when Apache was last started. As such, mod_file_cache

mod_auth_digest Includes additional support for session caching across processes using shared memory. mod_charset_lite New module in Apache 2.0. This experimental module allows for character set translation exception to this rule. Putting configuration restrictions in a section is perfectly safe because this section will apply to all requests regardless of the specific URL. Virtual Hosts The the complexity of actively ensuring the cachability of URLs, mod_file_cache offers file-handle and memory-mapping tricks to keep a cache of files as they were when Apache was last started. As such, mod_file_cache

mod_auth_digest Includes additional support for session caching across processes using shared memory. mod_charset_lite New module in Apache 2.0. This experimental module allows for character set translation exception to this rule. Putting configuration restrictions in a section is perfectly safe because this section will apply to all requests regardless of the specific URL. Virtual Hosts The the complexity of actively ensuring the cachability of URLs, mod_file_cache offers file-handle and memory-mapping tricks to keep a cache of files as they were when Apache was last started. As such, mod_file_cache

Rust的安全哲学 ❑ Safe API无论如何被使用都不应带来未定义行为 ❑ 程序员应避免直接使用unsafe code ❑ Interior unsafe：将unsafe code封装为safe API Safe APIs Safe API Unsafe APIs and FFIs call User Programs call call Safe Rust Unsafe Unsafe Rust Safe API access Memory Unsafe APIs Unsafe API call Unsafe API access call Rust实际表现如何？ ❑ 调研了2020年12月31日前报告的185个内存安全漏洞[TOSEM'21] ▪ Rust在内存安全防护方面效果不错 ▪ 所有的漏洞（除了1个编译器漏洞）都需要unsafe code (GitHub) [TOSEM'21] “Memory-safety challenge considered solved? An in-depth study with all Rust CVEs”, TOSEM, 2021. PoC #![forbid(unsafe_code)] Libraries unsafe code call safe (unsound) APIs Unsound

mod_auth_digest Includes additional support for session caching across processes using shared memory. mod_charset_lite New module in Apache 2.0. This experimental module allows for character set translation exception to this rule. Putting configuration restrictions in a section is perfectly safe because this section will apply to all requests regardless of the specific URL. Virtual Hosts The the complexity of actively ensuring the cachability of URLs, mod_file_cache offers file-handle and memory-mapping tricks to keep a cache of files as they were when Apache was last started. As such, mod_file_cache

same value is used at many places in the configuration. Reduced memory usage Despite many new features, 2.4.x tends to use less memory than 2.2.x. New Modules mod_proxy_fcgi FastCGI Protocol backend request body as a response via the output filter stack. mod_slotmem_shm Provides a Slot-based shared memory provider (ala the scoreboard). mod_xml2enc Formerly a third-party module, this supports internationalisation objects, based on the previous implementation of the mod_ssl session cache. Providers using a shared-memory cyclic buffer, disk-based dbm files, and a memcache distributed cache are currently supported. Cache

same value is used at many places in the configuration. Reduced memory usage Despite many new features, 2.4.x tends to use less memory than 2.2.x. New Modules mod_proxy_fcgi FastCGI Protocol backend request body as a response via the output filter stack. mod_slotmem_shm Provides a Slot-based shared memory provider (ala the scoreboard). mod_xml2enc Formerly a third-party module, this supports internationalisation objects, based on the previous implementation of the mod_ssl session cache. Providers using a shared-memory cyclic buffer, disk-based dbm files, and a memcache distributed cache are currently supported. Cache