s4hana memory reference ( SAP ABAP )

		Features
		Controls the memory sizes for all work processes
		Profile Parameter	Description	Default value	Unit	Restrictions	비고
		PHYS_MEMSIZE	Specifies the size of the main memory of the host on which AS ABAP is running.	Size of the main memory (RAM)	MB	-	기본값 메인 메모리 크기와 동일 아래의 메모리들은 PHYS_MEMSIZE 자동으로 참조 [메모리] em/initial_size_MB EM/TOTAL_SIZE_MB em/max_size_MB abap/heap_area_total rdisp/PG_SHM
		em/initial_size_MB	Specifies the total size of the extended memory (EM). The value is derived from the size of the physical main memory.	(min(512000, $(PHYS_MEMSIZE) * 0.7)) -> 메모리의 70%	MB	UNIX	인스턴스가 실행중인 주 메모리와 관련 있음 ztta/roll_extension 를 통해 사용자 최대 수 조정 가능
						Linux
						Windows
						IBM i
		EM/TOTAL_SIZE_MB	Controls the total size of the EM for the implementation of shared memory segments (SHM segments).	($(PHYS_MEMSIZE) * 0.7)	MB	AIX
		em/max_size_MB	Specifies the maximum size of the dynamically extendable EM.	(min(512000, $(PHYS_MEMSIZE) * 1.5))	MB	Windows	Windows 에서 확장할 수 있는 EM 의 상한
				($(em/initial_size_MB))	MB	UNIX	Windows 외에는 em/initial_size_MB 값 참조
						Linux
						IBM i
						AIX
		em/global_area_MB	Specifies the size of the global extended memory (EG).	(min($(em/initial_size_MB) * 0.05, 32000))	MB		the task handler or enqueue 같은 커널 구성용 내부 통신만 관여하므로 확장메모리의 5% 자동으로 계산됨.
		abap/heap_area_total	Specifies how much PRIV memory dialog and non-dialog work processes can allocate for user contexts.	$(PHYS_MEMSIZE) * 1024 * 1024	bytes	Windows	총 PRIV를 할당 할 수 있는 양 정의
				max($(PHYS_MEMSIZE)*1024*1024 * 0.1, $(abap/heap_area_dia) * 2)	bytes	UNIX
						Linux
						IBM i
						AIX
		em/proc_max_size_MB	Specifies the maximum amount of PROC memory all work processes together can use. The value 0 means that there is no limit to the PROC memory.	0	MB		PROC 메모리양 지정 ( PROC 는 작업 프로세스에 필요한 데이터에 사용 PRIV와 다르게 사용자 별로 지정 X) -> 자동 제어되며 수동으로 지정시 시스템 중단 될 수 있음.
		em/blocksize_KB	This value specifies the size of the blocks into which the segments of the extended segments memory (ES) are organized. The ES segments form the basis for the EM. If a user context requests memory from the extended memory, one or more blocks of this size are provided from the extended memory pool.	(ceil($(em/initial_size_MB) * 1024 / 100000 / 4096) * 4096)	KB		ES 세그먼트가 구성되는 블록 크기 지정
		em/address_space_MB	Specifies the size of the address space that the work process provides for the EM. This also defines the total possible sum of the extended memory (EM) and the global extended memory (EG) of a single user context.	($(em/initial_size_MB))	MB	Windows	EM 에서 제공되는 주소 공간의 크기 정의
				4096	MB	UNIX
						Linux
						IBM i
						AIX
		rdisp/PG_SHM	Specifies the size of the paging buffer. The value is derived from the size of the physical main memory.	(min(1000+40*max(5,floor(($(PHYS_MEMSIZE)-128)/20)),256000))	8 KB blocks		Pasing buffer 값 , 변경할 필요 x
		rdisp/PG_MAXFS	Specifies the size of the SAP paging file. The SAP paging file functions as memory for Extract to Memory and Export to Memory.	($(rdisp/PG_SHM))	8 KB blocks		명령어를 저장하는 Pasing buffer 값 , 변경할 필요 x
		rdisp/wppriv_max_no	The value specifies the maximum number of work processes that are allowed to be in PRIV mode.	0	Integer		EM 할당량(ztta/roll_extension)을 초과하면 PRIV 메모리로 할당되는데 이때 PRIV에 있을 수 있는 작업프로세스 수 정의
		rdisp/max_priv_time	This parameter value specifies the maximum time spent by a work process in PRIV mode.	0	Seconds		0 기본값 , 작업 프로세스에 대한 시간 제한 없음
		Controls the memory sizes for a work process
		Profile Parameter	Description	Default value	Unit	Restrictions	비고
		ztta/roll_extension	Specifies how much EM can be assigned to a user session (user context). The EM quota applies both to dialog work processes and to non-dialog work processes. The current parameter value is the default value for ztta/roll_extension_dia and ztta/roll_extension_nondia.	4000000000	bytes	Linux	em 할당량 정의 // em/initial_size_MB 양 보다 적어야함.
			ztta/roll_extension only takes effect if its value is lower than em/initial_size_MB.	2000000000	bytes	UNIX
						Windows
						IBM i
						AIX
		ztta/roll_extension_dia	Specifies the maximum amount of EM for dialog work processes.	$(ztta/roll_extension)	bytes		설정값 지정하면 ztta/roll_extension 의 값 엎어짐
			Note
			Set the parameter only if you want to change the limit explicitly.
		ztta/roll_extension_nondia	Specifies the maximum amount of EM for non-dialog work processes.	$(ztta/roll_extension)	bytes		"
			Note
			Set the parameter only if you want to change the limit explicitly.
		abap/heap_area_dia	This value specifies how much PRIV memory can be allocated for a user context by a single dialog work process. The aim is to limit the maximum size of user contexts so that one single user cannot occupy the entire memory available.	2000000000	bytes		PRIV 메모리 양 지정
		abap/heap_area_nondia	Specifies how much PRIV memory, a non-dialog work process (background, update, the system and print processes) can allocate for a user context. The aim is to limit the maximum size of user contexts so that one single user cannot occupy the entire memory available.	2000000000	bytes	Unix, Linux, IBM i, AIX	연관관계 있음 abap/heap_area_nondia or abap/heap_area_dia and profile parameter abap/heaplimit.
				0	bytes	Windows
		abap/heaplimit	This value specifies the amount of PRIV memory that, if exceeded, automatically restarts a work process after completion of the current transaction step. A bottleneck in the swap space should be prevented by using an automatic restart (as seldom as possible).	150000000	bytes		작업 프로세스 PRIV 에 대해 임계값 정의 , 임계값 초과시 프로그램 종료
		em/proc_max_wpsize_MB	Specifies the amount of PROC memory a single work process can use. The value 0 means that there is no limit to the PROC memory.	0	MB		최대 PROC 메모리 제한
		Controls the session memory size
		Profile Parameter	Description	Default value	Unit	Restrictions	비고
		em/sessionmem_warn	Specifies the value of the warning threshold for dialog work processes before the regular session memory quota has been reached.	0	Percentage (%)		EM + PRIV 값의 합 경고 임계값을 정의하여 높은 세션 메모리 사용으로 인한 리소스 병목 현상을 방지할 수 있습니다  Total of ztta/roll_extension_dia and abap/heap_area_dia Total of ztta/roll_extension_nondia and abap/heap_area_nondia
			When the threshold value is exceeded, a short dump without a program termination is written.
		em/sessionmem_warn_nondia	Specifies the value of the warning threshold for non-dialog work processes before the regular session memory quota has been reached.	0	Percentage (%)		"
			When the threshold value is exceeded, a short dump without a program termination is written.
		em/sessionmem_ext	Specifies the size of the extended session memory quota for dialog work processes.	0	Percentage (%)		내부 세션 메모리 할당
			If the limit is exceeded, the program is terminated and a short dump written.
			Value 0 means that this quota extension is deactivated.
		em/sessionmem_ext_nondia	Specifies the size of the extended session memory quota for non-dialog work processes.	0	Percentage (%)		ABAP 프로그램에 대한 세션 메모리 할당
			If you exceed the limit, the program is terminated and a short dump written.
			Value 0 means that this parameter is inactive.
		em/sessionmem_ext_warn	Specifies the value of the warning threshold for dialog work processes before the extended session memory quota has been reached.	0	Percentage (%)		EM + HEAP 메모리의 총 량
			When the threshold value is exceeded, a short dump without a program termination is written.
		em/sessionmem_ext_warn_nondia	Specifies the value of the warning threshold for non-dialog work processes before the extended session memory quota has been reached.	0	Percentage (%)
			When the threshold value is exceeded, a short dump without a program termination is written.
		EM implementation in SAP Memory Management
		Profile Parameter	Description	Default value	Unit	Restrictions	비고
		es/implementation	Activates the EM implementation with memory mapped files.	std	Special character string	UNIX
						Linux
						IBM i
				view	Special character string	Windows
		ES/TABLE	Activates the EM implementation of shared memory segments.	SHM_SEGS	Special character string	AIX
		SAP Memory Management Statistics
		Profile Parameter	Description	Default value	Unit	Restrictions	비고
		em/stat_log_size_MB	Displays the statistics of the size of the user context.	20	MB		메모리 관리 통계 목적
			If the defined parameter value is exceeded, in SAP Memory Management, the sizes of user contexts are collected for statistical purposes.
		em/stat_log_timeout	This parameter specifies the time interval with which the sizes are written to a file. Value 0 means that no file is written.	0	Min		파일에 기록하는 시간 기록
		Release of SAP memory to the operating system
		Profile Parameter	Description	Default value	Unit	Restrictions	비고
		es/disclaim_threshold_MB	Indicates the threshold from which memory blocks from the ES segments are released to the operating system.	0	bytes		이 매개변수를 사용하여 메모리 영역이 운영 체제로 릴리스되는 EM 채우기 레벨을 정의할 수 있습니다. 즉
			If memory blocks are requested above this threshold, for instance when there is a high load, these blocks are released for the operating system at the same time as they are released for the ABAP system.
			Value 0
		es/disclaim_coasting_time_alloc	This parameter specifies the length of time which a memory block from the ES segment that is currently allocated by the work process and swapped to the page file (or swap space) is released to the operating system once the configured release threshold is exceeded (es/disclaim_threshold_MB).	0	Seconds
		es/disclaim_coasting_time_free	This parameter specifies the length of time an allocated memory block from the ES segment that was released again by the work process is released to the operating system, after the configured release threshold (es/disclaim_threshold_MB) was exceeded.	0	Seconds
		es/blockdisclaimsize_KB	Specifies the size of the upper part of a memory block from the ES segment that is released to the operating system.	0	bytes
		es/freelist_compactor	Activates a better utilization of memory blocks from the ES segments when there is a high load. This reduces the fragmentation of the EM.	1	Truth value